Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
cau tren » cu tren, dau tren, ca tren
chat xuc » chat huu, cam xuc, chao xu
hieu van » hieu va, thien van, lieu va
van cau » van dau, van hau, van chat
va hanh » van hanh, va thanh, va danh
su sach » so sach, vu sach
sach tu » sach thu, cach tu, sach ty
tu nang » tru nang, tu nong, tu nano
x hoi » xa hoi, o hoi, x ho

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: su sach tu nang x hoi. hieu van ((pham duc) or (chat xuc)) ((va hanh) or (ban thanh)) van cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach tu nang x hoi. hieu van ((pham duc) OR (chat xuc)) ((va hanh) OR (ban thanh)) van cau tren.
• Adding a wildcard symbol may retrieve word variants: su sach tu nang x hoi. hieu van ((pham duc) or (chat xuc)) ((va hanh) or (ban thanh)) van cau tren*.