Perhaps you should try some spelling variations:
thuat phuc » thuat thuc, thuyet phuc, thuat phan
van thuat » va thuat, van thuan, van tuan
sach thu » sach thue, sach thieu, sach tham
thu nang » thi nang, thu hang, thu bang
hieu van » hieu va, thien van, lieu va
phuc cua » thuc cua, hoc cua, phuc vu
su sach » so sach, vu sach
nang xa » nang x, lang xa, nang ma
cua dan » cua dang, cua ban, ca dan
dan tai » van tai, dan thi, han tai
cua tre » cua te, cua triet, dua tren
cuu tre » cau tren, cau treo

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 thu nang xa hoi. hieu van thuat phuc cua dan tai ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach thu nang xa hoi. hieu van thuat phuc cua dan tai ((cua tre) OR (cuu tre)).
• Adding a wildcard symbol may retrieve word variants: su sach thu nang xa hoi. hieu van thuat phuc cua dan tai ((cua tre) or (cuu tre))*.