Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
va thanh » ban thanh, va tinh, le thanh
mai hoi » mai khoi, dai hoi, lai hoi
nam luc » nang luc, nhan luc, nam thuc
cua tre » cua te, cuu tre, cua triet
ma hoi » xa hoi, ma hoa, me hoi
vi cua » vai cua, di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu cac ky nang ((ma hoi) or (mai hoi)). hieu van nam luc ((va thanh) OR (gia thanh)) vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu cac ky nang ((ma hoi) OR (mai hoi)). hieu van nam luc ((va thanh) OR (gia thanh)) vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu cac ky nang ((ma hoi) or (mai hoi)). hieu van nam luc ((va thanh) OR (gia thanh)) vi cua tre".
• Adding a wildcard symbol may retrieve word variants: tu cac ky nang ((ma hoi) or (mai hoi)). hieu van nam luc ((va thanh) OR (gia thanh)) vi cua tre*.