Perhaps you should try some spelling variations:
ky lang » ky dang, ky tang, tay lang
hieu va » lieu va, hieu qua
hau luc » hau loc, cau luc, nhan luc
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
te cac » tu cac, ve cac, te cao
va hau » van hau, va chau, vat hau
luc va » duc va, tuc va, loc va
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: te cac ((ky lang) or (ky nang)) xa hoi. hieu va hau luc va hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te cac ((ky lang) OR (ky nang)) xa hoi. hieu va hau luc va hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: te cac ((ky lang) or (ky nang)) xa hoi. hieu va hau luc va hanh vi cua tre*.