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