Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
luoc can » luc canh, hoc can, luoc dai
vien cac » vien bach, vien dai, vien da
ve triet » va trien, su triet
nang ma » tang ma, sang ma, nang cao
duc van » duc va, duc tan, duc manh
te sach » toc sach
ma hoi » mai hoi, xa hoi, ma hoa
te sac » te cac, te san
vi ve » va ve, gi ve, ve ve

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 sach)) ky nang ma hoi. hieu vien cac ((duc van) or (luoc can)) hanh vi ve triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sac) OR (te sach)) ky nang ma hoi. hieu vien cac ((duc van) OR (luoc can)) hanh vi ve triet.
• Adding a wildcard symbol may retrieve word variants: ((te sac) or (te sach)) ky nang ma hoi. hieu vien cac ((duc van) or (luoc can)) hanh vi ve triet*.