Perhaps you should try some spelling variations:
thanh tai » thanh hai, thanh toan, doanh tai
van thanh » ban thanh, van tuan
cau tren » cu tren, dau tren, ca tren
tai cau » tai cac, tai cao
vuc van » duc van, luc van, thuc van
cac vuc » cac nuoc, cac vung, cac cuoc
hieu va » lieu va, hieu qua
tu sach » thu sach, te sach, tu cach
su sach » so sach, vu sach
o hoi » co hoi, o hoc, o hoa
o hai » co hai, so hai, o lai

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)) ky nang ((o hoi) or (o hai)). hieu va cac vuc van thanh tai cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) ky nang ((o hoi) OR (o hai)). hieu va cac vuc van thanh tai cau tren.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (su sach)) ky nang ((o hoi) or (o hai)). hieu va cac vuc van thanh tai cau tren*.