Perhaps you should try some spelling variations:
thanh tai » thanh hai, thanh toan, doanh tai
cao thuc » cao thuoc, bao thuc, can thuc
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
nang ho » nang hoc, nang co, tang ho
hieu va » lieu va, hieu qua
van dai » vanh dai, van dao, van hai
nang o » nang co, nang ro, nang x
va cao » va cac, va co, va dao
cua te » cua tu

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

• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty ((nang o) OR (nang ho)) hai. hieu va cao thuc vat ((thanh tai) OR (van dai)) cua te~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty ((nang o) OR (nang ho)) hai. hieu va cao thuc vat ((thanh tai) or (van dai)) cua te~".
• Adding a wildcard symbol may retrieve word variants: tu sach ty ((nang o) OR (nang ho)) hai. hieu va cao thuc vat ((thanh tai) or (van dai)) cua te*.