Perhaps you should try some spelling variations:
thanh tai » thanh hai, thanh toan, doanh tai
sang mai » sang ma, sang tai, lang mai
su sach » so sach, vu sach
hieu va » lieu va, hieu qua
thuc va » thuc vat, thuc dan, thuc day
cuc tre » duc tre, cua tre, cuu tre
sach tu » sach thu, cach tu, sach ty
hieu ve » hieu van
mai hoi » mai khoi, dai hoi, lai hoi
tu sang » thu sang, tu san, tu lang

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach tu sang mai hoi. ((hieu ve) OR (hieu va)) cam ((thuc va) or (duc va)) thanh tai cuc tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach tu sang mai hoi. ((hieu ve) OR (hieu va)) cam ((thuc va) OR (duc va)) thanh tai cuc tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach tu sang mai hoi. ((hieu ve) OR (hieu va)) cam ((thuc va) or (duc va)) thanh tai cuc tre".
• Adding a wildcard symbol may retrieve word variants: su sach tu sang mai hoi. ((hieu ve) OR (hieu va)) cam ((thuc va) or (duc va)) thanh tai cuc tre*.