Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
van hanh » van thanh, ban hanh, van anh
xuc van » duc van, luc van, xuc ban
tu sach » thu sach, te sach, tu cach
ty nang » ky nang, ty xang, ty hang
su sach » so sach, vu sach
ve cac » va cac, vien cac
kem va » kiem va, kiem van
ve cam » ve cham, va cam, ve cai
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: ((tu sach) OR (su sach)) ty nang x hoi. hieu ((ve cam) or (ve cac)) xuc van hanh kem va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) ty nang x hoi. hieu ((ve cam) OR (ve cac)) xuc van hanh kem va triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (su sach)) ty nang x hoi. hieu ((ve cam) or (ve cac)) xuc van hanh kem va triet".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (su sach)) ty nang x hoi. hieu ((ve cam) or (ve cac)) xuc van hanh kem va triet*.