Perhaps you should try some spelling variations:
vanh tai » van tai, hanh tai, anh tai
thi nang » thi cong, ki nang, thi hanh
nang doc » nang luc
so sach » bo sach, co sach, hoc sach
tai cua » thai cua, tai cuc, tri cua
thuc va » thuc vat, thuc dan, thuc day
chuc va » thuc vat
va pham » van pham, va phat, va phap
hieu va » lieu va, hieu qua
doc hoi » duoc hoi, hoc hoi, doc hai
so sanh » do sanh
cua tu » cua tuc, cua su, cua cu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((so sach) or (so sanh)) thi nang doc hoi. hieu va pham ((chuc va) or (thuc va)) vanh tai cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((so sach) OR (so sanh)) thi nang doc hoi. hieu va pham ((chuc va) OR (thuc va)) vanh tai cua tu.
• Adding a wildcard symbol may retrieve word variants: ((so sach) or (so sanh)) thi nang doc hoi. hieu va pham ((chuc va) or (thuc va)) vanh tai cua tu*.