Perhaps you should try some spelling variations:
va thanh » gia thanh, ban thanh, va tinh
van hanh » van thanh, ban hanh, van anh
vu sach » vu bach, vu khach
su sach » so sach
ty nang » ky nang, ty xang, ty hang
cac xuc » cam xuc, cac nuoc, chat xuc
vai va » mai va, dai va, hai va
x hoi » xa hoi, o hoi, x ho
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 (su sach)) ty nang x hoi. lieu va cac xuc ((va thanh) or (van hanh)) vai va thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu sach) OR (su sach)) ty nang x hoi. lieu va cac xuc ((va thanh) OR (van hanh)) vai va thiet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((vu sach) OR (su sach)) ty nang x hoi. lieu va cac xuc ((va thanh) or (van hanh)) vai va thiet".
• Adding a wildcard symbol may retrieve word variants: ((vu sach) OR (su sach)) ty nang x hoi. lieu va cac xuc ((va thanh) or (van hanh)) vai va thiet*.