Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
hanh vai » hanh vi, hanh va, hanh tai
van hanh » van thanh, ban hanh, van anh
sach ky » sac ky, sach y, sach ty
su sach » so sach, vu sach
ve bac » ve cac, ve ban, he bac
ve bao » te bao, va bao
bo van » vo van, so van, do van
vai su » va su, van su, lai su
x hoi » o hoi, x ho, 5 hoi

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 ky nang ((x hoi) or (xa hoi)). hieu ((ve bac) OR (ve bao)) bo van hanh vai su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang ((x hoi) OR (xa hoi)). hieu ((ve bac) OR (ve bao)) bo van hanh vai su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang ((x hoi) or (xa hoi)). hieu ((ve bac) OR (ve bao)) bo van hanh vai su triet".
• Adding a wildcard symbol may retrieve word variants: su sach ky nang ((x hoi) or (xa hoi)). hieu ((ve bac) OR (ve bao)) bo van hanh vai su triet*.