Perhaps you should try some spelling variations:
hai chu » hai chau, hoi chu, hai chi
hai cau » hai chau, hai hau, hoi cau
va hanh » van hanh, va thanh, va danh
tu sach » thu sach, su sach, te sach
hieu va » lieu va, hieu qua
cau luc » cau truc, cau phuc
va cau » van cau, va cac, va dau
y nang » ky nang, ly nang, v nang
luc va » duc va, tuc va, loc va
ma hoi » mai hoi, ma hoa, me hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach y nang ((ma hoi) or (xa hoi)). hieu va cau luc va hanh ((hai cau) or (hai chu)) treo~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang ((ma hoi) OR (xa hoi)). hieu va cau luc va hanh ((hai cau) OR (hai chu)) treo.
• Adding a wildcard symbol may retrieve word variants: tu sach y nang ((ma hoi) or (xa hoi)). hieu va cau luc va hanh ((hai cau) or (hai chu)) treo*.