Perhaps you should try some spelling variations:
thanh van » thanh san, thanh toan, thanh phan
ban thanh » ban hanh, ban hang
cau tren » cu tren, dau tren, ca tren
hieu van » hieu va, thien van, lieu va
cau cua » cau qua, ca cua, cu cua
cuu tre » cua tre, cau treo
tu sach » thu sach, su sach, tu cach
te sach » toc sach
van cau » van dau, van hau, van chat
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: ((tu sach) or (te sach)) ky nang x hoi. hieu van cau cua ban thanh van ((cuu tre) OR (cau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (te sach)) ky nang x hoi. hieu van cau cua ban thanh van ((cuu tre) OR (cau tren)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (te sach)) ky nang x hoi. hieu van cau cua ban thanh van ((cuu tre) OR (cau tren))".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (te sach)) ky nang x hoi. hieu van cau cua ban thanh van ((cuu tre) OR (cau tren))*.