Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
danh sai » dung sai, danh bat, danh dau
thuc day » thuc dan, thuc vat
sach tu » sach thu, cach tu, sach ty
danh va » doanh va, hanh va, anh va
cua tre » cua te, cuu tre, cua triet
thuc va » thuc vat, thuc dan
hieu va » lieu va, hieu qua
nang xa » nang x, lang xa, nang ma
tu nang » tru nang, tu nong, tu nano

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach tu nang xa hoi. hieu va doc ((thuc va) or (thuc day)) ((danh sai) or (danh va)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach tu nang xa hoi. hieu va doc ((thuc va) OR (thuc day)) ((danh sai) OR (danh va)) cua tre.
• Adding a wildcard symbol may retrieve word variants: toc sach tu nang xa hoi. hieu va doc ((thuc va) or (thuc day)) ((danh sai) or (danh va)) cua tre*.