Perhaps you should try some spelling variations:
te sach » toc sach
mai hoi » mai khoi, dai hoi, lai hoi
hieu ve » hieu va, hieu van
hanh va » hang va, hanh vi
y nang » ky nang, ly nang, v nang
ve cau » ke cau, va cau, ve cac
loc va » hoc va, luc va
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 y nang ((ma hoa) or (mai hoi)). hieu ve cau ((loc va) or (duc va)) hanh va cua su~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach y nang ((ma hoa) OR (mai hoi)). hieu ve cau ((loc va) OR (duc va)) hanh va cua su.
• Adding a wildcard symbol may retrieve word variants: te sach y nang ((ma hoa) or (mai hoi)). hieu ve cau ((loc va) or (duc va)) hanh va cua su*.