Perhaps you should try some spelling variations:
luoc can » luc canh, hoc can, luoc dai
cua viet » ca viet, hoa viet, cua vat
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
duc van » duc va, duc tan, duc manh
te sac » te sach, te san
te cac » tu cac, te cao, de cac
ve cac » va cac, vien cac
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 sac) or (te cac)) ky nang xa hoi. hieu ve cac ((duc van) or (luoc can)) hanh vi cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sac) OR (te cac)) ky nang xa hoi. hieu ve cac ((duc van) OR (luoc can)) hanh vi cua viet.
• Adding a wildcard symbol may retrieve word variants: ((te sac) or (te cac)) ky nang xa hoi. hieu ve cac ((duc van) or (luoc can)) hanh vi cua viet*.