Perhaps you should try some spelling variations:
ban thanh » ban hang
ban hanh » ban hang
hieu van » hieu va, thien van, lieu va
tu sach » thu sach, te sach, tu cach
vai cuu » vai cua
van cam » van nam, van lam, van cau
cam duc » cam xuc, cao duc, pham duc
nang xa » nang x, lang xa, nang ma
su sach » so sach, vu sach
cuu tre » cua tre, cau tren, cau treo

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 xa hoi. hieu van cam duc ((ban thanh) or (ban hanh)) vai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) ky nang xa hoi. hieu van cam duc ((ban thanh) OR (ban hanh)) vai cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (su sach)) ky nang xa hoi. hieu van cam duc ((ban thanh) or (ban hanh)) vai cuu tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (su sach)) ky nang xa hoi. hieu van cam duc ((ban thanh) or (ban hanh)) vai cuu tre*.