Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
hang vai » hang va, hang tai, hang hai
ban hang » ngan hang
hieu van » hieu va, thien van, lieu va
duc ban » duc tan, duc van, dua ban
cuu tre » cua tre, cau treo
te sach » toc sach
van cac » van hac, van cau, van bac
su sach » so sach, vu sach
cac duc » cac du, cao duc, cac dac
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: ((te sach) or (su sach)) ky nang x hoi. hieu van cac duc ban hang vai ((cuu tre) OR (cau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (su sach)) ky nang x hoi. hieu van cac duc ban hang vai ((cuu tre) OR (cau tren))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) or (su sach)) ky nang x hoi. hieu van cac duc ban hang vai ((cuu tre) OR (cau tren))*".