Perhaps you should try some spelling variations:
thanh van » thanh san, thanh toan, thanh phan
van thanh » ban thanh, van tuan
hau tren » dau tren, cau tren, thai tren
cham xuc » cam xuc, chat xuc, pham duc
sach ky » sac ky, sach y, sach ty
van hau » van ha, van hai, van dau
tu sach » thu sach, su sach, te sach
hieu va » lieu va, hieu qua
nang ma » tang ma, sang ma, nang cao
nang va » nang van, hang va, bang va

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 ky ((nang va) OR (nang ma)) hoi. hieu va ((cham xuc) or (cham soc)) van thanh van hau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky ((nang va) OR (nang ma)) hoi. hieu va ((cham xuc) OR (cham soc)) van thanh van hau tren*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky ((nang va) OR (nang ma)) hoi. hieu va ((cham xuc) or (cham soc)) van thanh van hau tren*".