Perhaps you should try some spelling variations:
bach ky » bac ky
nang ma » tang ma, sang ma, nang cao
hieu ve » hieu van
hieu va » hieu qua
va dung » van dung, va duong, vat dung
tai cua » thai cua, tai cuc, tri cua
cua tre » cua te, cuu tre, cua triet
ma hoi » mai hoi, xa hoi, ma hoa
nam tu » nam thu, nam thuc

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

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