Perhaps you should try some spelling variations:
su triet » su tien, ve triet
van hanh » van thanh, ban hanh, van anh
su sach » vu sach
hanh oi » hanh noi, hanh moi, hanh voi
su viet » so viet
hieu ve » hieu va, hieu van
so sach » so sanh, bo sach, co sach
ve cam » ve cham, ve cac, va cam
tu van » tu va
cam tu » cam thu, nam tu, dam tu
x hoi » xa hoi, o hoi, x ho

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