Perhaps you should try some spelling variations:
va thieu » va thiet, va hieu, va tieu
nhan tai » hang tai, van tai, toan tai
va cham » va chat, va tham
va nhan » van nhan, ca nhan, va phan
thuc va » thuc vat, thuc dan, thuc day
sach ty » sach y, sach tu, sach thu
ve cham » ve chat, vu cham, ve chim
tai va » thai va, mai va, tri va
x hoi » xa hoi, o hoi, x ho

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 ty) or (sach thieu)) nang x hoi. hieu ((ve cham) or (va cham)) thuc va nhan tai va thieu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ty) OR (sach thieu)) nang x hoi. hieu ((ve cham) OR (va cham)) thuc va nhan tai va thieu.
• Adding a wildcard symbol may retrieve word variants: su ((sach ty) or (sach thieu)) nang x hoi. hieu ((ve cham) or (va cham)) thuc va nhan tai va thieu*.