Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
luoc can » luc canh, hoc can, luoc dai
nang mai » nang ma, nang tai, lang mai
hieu ve » hieu va, hieu van
mai hoi » mai khoi, dai hoi, lai hoi
te sach » toc sach
ve cac » va cac, vien cac
te sac » te cac, te san
vi va » vi van, vai va, vu va

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