Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
te sach » toc sach
va chua » vua chua, ca chua, va chu
hanh va » hang va, hanh vi
va hanh » van hanh, va thanh, va danh
cau luc » cau truc, cau phuc
chua su » cua su, chua cu, chua tu
hieu ve » hieu va
mai hoi » mai khoi, dai hoi, lai hoi
y nang » ky nang, ly nang, v nang
luc va » duc va, tuc va, loc va
ma hoi » xa 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: te sach y nang ((ma hoi) or (mai hoi)). ((hieu ve) OR (hieu van)) cau luc va hanh va chua su~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach y nang ((ma hoi) OR (mai hoi)). ((hieu ve) OR (hieu van)) cau luc va hanh va chua su.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach y nang ((ma hoi) or (mai hoi)). ((hieu ve) OR (hieu van)) cau luc va hanh va chua su".
• Adding a wildcard symbol may retrieve word variants: te sach y nang ((ma hoi) or (mai hoi)). ((hieu ve) OR (hieu van)) cau luc va hanh va chua su*.