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