Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
van hanh » van thanh, ban hanh, van anh
nang cai » nang cao, nang tai, nang cap
va hanh » va thanh, va danh, ban hanh
su sach » vu sach
cai hoi » cau hoi, dai hoi, cai hoa
so sach » so sanh, bo sach, co sach
hieu ve » hieu va, hieu van
ve cam » ve cham, ve cac, va cam
vai su » va su, van su, lai su

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) or (so sach)) ky nang cai hoi. hieu ve cam xuc ((va hanh) OR (van hanh)) vai su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (so sach)) ky nang cai hoi. hieu ve cam xuc ((va hanh) OR (van hanh)) vai su triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (so sach)) ky nang cai hoi. hieu ve cam xuc ((va hanh) OR (van hanh)) vai su triet*".