Perhaps you should try some spelling variations:
te sach » toc sach
mai hoi » mai khoi, dai hoi, lai hoi
hanh va » hang va, hanh vi
hieu ve » hieu va, hieu van
sach v » sach va, sach y, sach 2
ve cau » ke cau, va cau, ve cac
ma hoi » xa hoi, ma hoa, me hoi
tuc va » thuc va, truc va, tuc xa
v nang » va nang, vu nang, van nang
va cua » va chua, via cua, ca cua
cua su » qua su

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach v nang ((ma hoi) or (mai hoi)). hieu ve cau ((tuc va) or (duc va)) hanh va cua su~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach v nang ((ma hoi) OR (mai hoi)). hieu ve cau ((tuc va) OR (duc va)) hanh va cua su.
• Adding a wildcard symbol may retrieve word variants: te sach v nang ((ma hoi) or (mai hoi)). hieu ve cau ((tuc va) or (duc va)) hanh va cua su*.