Perhaps you should try some spelling variations:
thanh dai » thanh hai, thanh dat, thanh oai
thanh tai » thanh hai, thanh toan, doanh tai
so sach » so sanh, bo sach, co sach
truc va » thuc va, trung va
sach vu » sach va, sach tu, sach uu
hieu ve » hieu va, hieu van
nang ma » tang ma, sang ma, nang cao
vu nang » vuc nang, va nang, vu dang
ve cam » ve cham, ve cac, va cam
ma hoi » mai hoi, xa hoi, ma hoa
cua te » cua tu

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 vu nang ma hoi. hieu ve cam ((truc va) or (thuc vat)) ((thanh dai) OR (thanh tai)) cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach vu nang ma hoi. hieu ve cam ((truc va) OR (thuc vat)) ((thanh dai) OR (thanh tai)) cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach vu nang ma hoi. hieu ve cam ((truc va) or (thuc vat)) ((thanh dai) OR (thanh tai)) cua te".
• Adding a wildcard symbol may retrieve word variants: so sach vu nang ma hoi. hieu ve cam ((truc va) or (thuc vat)) ((thanh dai) OR (thanh tai)) cua te*.