Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hieu vien » hieu hien, hieu viec, thieu nien
van hanh » van thanh, ban hanh, van anh
vien cac » vien bach, vien dai, vien da
vai cua » dai cua, hai cua, lai cua
va tinh » may tinh
su sach » so sach, vu sach
va hanh » va thanh, va danh, ban hanh
cac tac » cac toc, cac bac, cac dac
nang ma » tang ma, sang ma, nang cao
y nang » ky nang, ly nang, v nang
ma hoi » mai hoi, xa hoi, ma hoa

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: su sach y nang ma hoi. hieu vien cac tac ((((va hanh) or (van hanh))) or (va tinh)) vai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y nang ma hoi. hieu vien cac tac ((((va hanh) OR (van hanh))) OR (va tinh)) vai cua triet.
• Adding a wildcard symbol may retrieve word variants: su sach y nang ma hoi. hieu vien cac tac ((((va hanh) or (van hanh))) or (va tinh)) vai cua triet*.