Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
hanh tai » thanh tai, hang tai, han tai
lang xa » lang ha, dang xay, lang van
hieu va » lieu va, hieu qua
thuc va » thuc vat, thuc dan, thuc day
cuc tre » duc tre, cua tre, cuu tre
va cam » va cham, va cac, va cao
luc va » duc va, tuc va, loc va

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach y ((nang x) or (lang xa)) hoi. hieu va cam ((luc va) or (thuc va)) hanh tai cuc tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach y ((nang x) OR (lang xa)) hoi. hieu va cam ((luc va) OR (thuc va)) hanh tai cuc tre.
• Adding a wildcard symbol may retrieve word variants: thu sach y ((nang x) or (lang xa)) hoi. hieu va cam ((luc va) or (thuc va)) hanh tai cuc tre*.