Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
hieu ve » hieu va, hieu van
hanh va » hang va, hanh vi
hoc can » hoc dan, hoc cao, hoc cac
nang ma » tang ma, sang ma, nang cao
te sac » te sach, te cac
ma hoi » mai hoi, xa hoi, ma hoa
te san » te ban, ke san, tu san
ve cac » va cac, vien cac
va va » va van, va vua, va vai

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 san)) ky nang ma hoi. hieu ve cac ((duc va) or (hoc can)) hanh va va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sac) OR (te san)) ky nang ma hoi. hieu ve cac ((duc va) OR (hoc can)) hanh va va triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sac) OR (te san)) ky nang ma hoi. hieu ve cac ((duc va) or (hoc can)) hanh va va triet".
• Adding a wildcard symbol may retrieve word variants: ((te sac) OR (te san)) ky nang ma hoi. hieu ve cac ((duc va) or (hoc can)) hanh va va triet*.