Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
su sach » vu sach
cham xu » chao xu, cham cuu, chat xuc
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
ty nang » ky nang, ty xang, ty hang
so sach » so sanh, bo sach, co sach
xu van » tu van, vu van, su van
tri ca » tri cua, tri cac, tri co
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)) ty nang x hoi. hieu ve cham xu van hanh ((tri ca) OR (tri va)) viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (so sach)) ty nang x hoi. hieu ve cham xu van hanh ((tri ca) OR (tri va)) viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (so sach)) ty nang x hoi. hieu ve cham xu van hanh ((tri ca) OR (tri va)) viet".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (so sach)) ty nang x hoi. hieu ve cham xu van hanh ((tri ca) OR (tri va)) viet*.