Perhaps you should try some spelling variations:
tu tieng » luc tieng, tu tuong, tu trong
te sach » toc sach
nang xa » nang x, lang xa, nang ma
hieu su » hieu sau, tieu su, hieu so
su cham » su pham, tu cham, vu cham
thuc va » thuc vat, thuc dan, thuc day
y nang » ky nang, ly nang, v nang
dau vi » dau ve, dau va, dat vi
vi tu » vi tut, voi tu, va tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach y nang xa hoi. hieu su cham ((duc va) or (thuc va)) dau vi tu tieng~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach y nang xa hoi. hieu su cham ((duc va) OR (thuc va)) dau vi tu tieng.
• Adding a wildcard symbol may retrieve word variants: te sach y nang xa hoi. hieu su cham ((duc va) or (thuc va)) dau vi tu tieng*.