Perhaps you should try some spelling variations:
giam muong » gian muong, gia luong, giac mong
trinh dong » trinh duong, trinh dung, trinh cong
dong giam » duong giam, dong giao, dung giam
sac trinh » lap trinh, dac tinh, cac tinh
gia cuong » gia cong, gian muong, gia dung
gia tuong » gian muong, gia cong, gia tang
thu sach » thuat sach, thuoc sach, thu hoach
sac tinh » dac tinh, cac tinh, sat tinh
kinh hoc » sinh hoc, hinh hoc, tinh hoc
kinh de » kinh te, kinh do, sinh de
hoc gia » hoc giao, hoc giai, toc gia
tinh do » trinh do, tinh doi, tinh da
kinh ve » kinh te, dinh ve, minh ve
tu sach » su sach, te sach, tu cach
tu sac » tu cac, tu san, tu bac
do gia » do giua, ho gia, co gia

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: (((( tu sach ((kinh de) or (kinh ve)) gia tuong ) or ( ((tu sach) or (thu sach)) kinh hoc gia tuong ))) or ((( tu sac tinh do gia cuong ) or ( tu sac trinh dong giam muong ))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (((( tu sach ((kinh de) OR (kinh ve)) gia tuong ) OR ( ((tu sach) OR (thu sach)) kinh hoc gia tuong ))) OR ((( tu sac tinh do gia cuong ) OR ( tu sac trinh dong giam muong )))).
• Adding a wildcard symbol may retrieve word variants: (((( tu sach ((kinh de) or (kinh ve)) gia tuong ) or ( ((tu sach) or (thu sach)) kinh hoc gia tuong ))) or ((( tu sac tinh do gia cuong ) or ( tu sac trinh dong giam muong ))))*.