Perhaps you should try some spelling variations:
ban hanh » ban hang
cham dua » chay dua, cham giua, pham duc
cua tre » cua te, cuu tre, cua triet
dua ban » dia ban, cua ban, qua ban
mai hoi » mai khoi, dai hoi, lai hoi
hieu ve » hieu van
hieu va » lieu va, hieu qua
vi cua » vai cua, di cua
tu van » tu 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: tu van ky nang ((ma hoi) or (mai hoi)). ((hieu ve) OR (hieu va)) cham dua ban hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu van ky nang ((ma hoi) OR (mai hoi)). ((hieu ve) OR (hieu va)) cham dua ban hanh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu van ky nang ((ma hoi) or (mai hoi)). ((hieu ve) OR (hieu va)) cham dua ban hanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: tu van ky nang ((ma hoi) or (mai hoi)). ((hieu ve) OR (hieu va)) cham dua ban hanh vi cua tre*.