Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
hanh dai » hanh tai, hanh dao, vanh dai
va hanh » van hanh, va thanh, va danh
cac dai » cac dan, cac bai, can dai
so sanh » do sanh
sanh ky » hanh ky, sang ky, nganh ky
ky sang » ky nang, ky dang, ky tang
ma hoi » mai hoi, ma hoa, me hoi
dai va » mai va
cua tu » cua tuc, cua su, cua cu

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sanh ky sang ((ma hoi) or (xa hoi)). ((hieu vien) or (thien nhien)) cac dai va hanh dai cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sanh ky sang ((ma hoi) OR (xa hoi)). ((hieu vien) OR (thien nhien)) cac dai va hanh dai cua tu.
• Adding a wildcard symbol may retrieve word variants: so sanh ky sang ((ma hoi) or (xa hoi)). ((hieu vien) or (thien nhien)) cac dai va hanh dai cua tu*.