Perhaps you should try some spelling variations:
hanh mai » hanh ma, hanh mau, hanh may
va triet » va thiet, va trien, ve triet
nang ma » tang ma, sang ma, nang cao
hieu ve » hieu va, hieu van
duc van » duc va, duc tan, duc manh
te sac » te sach, te cac
te san » te ban, ke san, tu san
ma hoi » mai hoi, xa hoi, ma hoa
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 sac) OR (te san)) ky nang ma hoi. hieu ve cac ((duc van) or (hoc dan)) hanh mai 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 van) OR (hoc dan)) hanh mai 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 van) or (hoc dan)) hanh mai va triet".
• Adding a wildcard symbol may retrieve word variants: ((te sac) OR (te san)) ky nang ma hoi. hieu ve cac ((duc van) or (hoc dan)) hanh mai va triet*.