Perhaps you should try some spelling variations:
thanh thai » thanh hai, thanh tai, nhanh thai
van thanh » ban thanh, van tuan
thu sach » tu sach, thuat sach, thuoc sach
thai cau » thai cao, toan cau, thai van
cau tren » cu tren, dau tren, ca tren
cac vuc » cac nuoc, cac vung, cac cuoc
hieu va » lieu va, hieu qua
vuc van » duc van, luc van, thuc van
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: ((thu sach) or (su sach)) ky nang ((o hoi) or (o hai)). hieu va cac vuc van thanh thai cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (su sach)) ky nang ((o hoi) OR (o hai)). hieu va cac vuc van thanh thai cau tren.
• Adding a wildcard symbol may retrieve word variants: ((thu sach) or (su sach)) ky nang ((o hoi) or (o hai)). hieu va cac vuc van thanh thai cau tren*.