Perhaps you should try some spelling variations:
thanh thai » thanh hai, thanh tai, nhanh thai
ban thanh » ban hanh, ban hang
cau tren » cu tren, dau tren, ca tren
thai cau » thai cao, toan cau, thai van
vuc ban » vu ban, duc ban, cuc ban
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 ban thanh thai 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 ban thanh thai 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 ban thanh thai cau tren*.