Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
luoc can » luc canh, hoc can, luoc dai
duc van » duc va, duc tan, duc manh
hieu ve » hieu va, hieu van
nang ma » tang ma, sang ma, nang cao
te sach » toc sach
ma hoi » mai hoi, xa hoi, ma hoa
ve cac » va cac, vien cac
vi cua » vai cua, di cua
te sac » te cac, te san

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