Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
chat xuc » chat huu, cam xuc, chao xu
van chat » cao chat
nang dai » nang dau, nang tai, lang dai
hieu van » hieu va, thien van, lieu va
vu sach » vu bach, vu khach
hanh va » hang va, hanh vi
xuc van » duc van, luc van, vuc van
dai hoi » dai hoc, dai hai, dai moi
su sach » so sach
te sach » toc sach
va va » va van, va vua, va vai
thiet » thieu

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((((vu sach) or (te sach))) or (su sach)) ky nang dai hoi. hieu van chat xuc van hanh va va thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((((vu sach) OR (te sach))) OR (su sach)) ky nang dai hoi. hieu van chat xuc van hanh va va thiet.
• Adding a wildcard symbol may retrieve word variants: ((((vu sach) or (te sach))) or (su sach)) ky nang dai hoi. hieu van chat xuc van hanh va va thiet*.