Perhaps you should try some spelling variations:
sach trien » sach tien, sach tren, sach thieu
trinh khoa » trinh hoa, sinh khoa, trinh hoi
dich thoat » dich thuat, tich hoat, dich khoa
trien chi » trien thi, trien khai, trieu thi
chi trinh » thi trinh, chi minh, chi binh
thoat phu » thuat phuc, hoa phu, khoa phu
phu thong » pho thong, phap thong, khau thong
sach thi » sach thu, sach tai, sach thieu
thi dich » thi bich, tri dich, tnhh dich
su sach » so sach, vu sach
khoa he » hoa he, khoa hoc, khong he
thi thi » thi thai, thi thin, thi thu

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( su sach trien chi trinh khoa he thong ) or ( su sach thi thi dich thoat phu thong ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( su sach trien chi trinh khoa he thong ) OR ( su sach thi thi dich thoat phu thong )).
• Adding a wildcard symbol may retrieve word variants: (( su sach trien chi trinh khoa he thong ) or ( su sach thi thi dich thoat phu thong ))*.