Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
hang dau » hang va, hang tai
dau cua » dai cua, day cua, cau cua
thuc va » thuc vat, thuc dan, thuc day
truc va » thuc vat, trung va
su sach » so sach, vu sach
hieu ve » hieu va, hieu van
tang ma » mang may, tang van
nang ma » sang ma, nang cao, mang may
sach v » sach va, sach y, sach 2
ve cam » ve cham, ve cac, va cam

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 v ((nang ma) or (tang ma)) hoi. hieu ve cam ((truc va) or (thuc va)) hang dau cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach v ((nang ma) OR (tang ma)) hoi. hieu ve cam ((truc va) OR (thuc va)) hang dau cua viet.
• Adding a wildcard symbol may retrieve word variants: su sach v ((nang ma) or (tang ma)) hoi. hieu ve cam ((truc va) or (thuc va)) hang dau cua viet*.