Perhaps you should try some spelling variations:
cua triet » cua viet, su triet
luoc can » luc canh, hoc can, luoc dai
va triet » va thiet, va trien, ve triet
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
duc van » duc va, duc tan, duc manh
te sai » te tai, te bai, te lai
sai ky » sac ky
ve cac » va cac, vien cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sai ky nang xa hoi. hieu ve cac ((duc van) or (luoc can)) hanh vi ((cua triet) OR (va triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sai ky nang xa hoi. hieu ve cac ((duc van) OR (luoc can)) hanh vi ((cua triet) OR (va triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sai ky nang xa hoi. hieu ve cac ((duc van) or (luoc can)) hanh vi ((cua triet) OR (va triet))".
• Adding a wildcard symbol may retrieve word variants: te sai ky nang xa hoi. hieu ve cac ((duc van) or (luoc can)) hanh vi ((cua triet) OR (va triet))*.