Perhaps you should try some spelling variations:
hieu vien » hieu hien, thieu nien, hieu tieng
hieu viec » nhieu viec, hieu ve, sieu viet
sang ky » sang kyo, dang ky, tang ky
cua tre » cua te, cua triet, dua tren
va hanh » van hanh, va thanh, va danh
cac dac » cac dan, cac dai, cac bac
so sang » so sanh, so dang, so lang
ky lang » ky nang, ky dang, ky tang
lang ha » long ha
cuu tre » cau tren, cau treo
ha hoi » hoa hoi, ha noi, xa hoi
dac va » duc va, day va, dat va

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sang ky lang ha hoi. ((hieu vien) or (hieu viec)) cac dac va hanh vi ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sang ky lang ha hoi. ((hieu vien) OR (hieu viec)) cac dac va hanh vi ((cua tre) OR (cuu tre)).
• Adding a wildcard symbol may retrieve word variants: so sang ky lang ha hoi. ((hieu vien) or (hieu viec)) cac dac va hanh vi ((cua tre) or (cuu tre))*.