Perhaps you should try some spelling variations:
hoang ban » hoang van, hang ban, hoang bao
vay hoang » van hoang, vao hoang, huy hoang
hieu van » hieu va, thien van, lieu va
te sach » toc sach
ban cua » ban quan
cac tuc » cac toc, cac tac, cac nuoc
ky dang » ky danh
cua tre » cua te, cuu tre, cua triet
ha hoi » hoa hoi, ha noi, xa hoi
cac tu » cac thu, cach tu, cac du

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 ((ky dang) or (ky nang)) ha hoi. hieu van ((cac tuc) OR (cac tu)) vay hoang ban cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((ky dang) OR (ky nang)) ha hoi. hieu van ((cac tuc) OR (cac tu)) vay hoang ban cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((ky dang) or (ky nang)) ha hoi. hieu van ((cac tuc) OR (cac tu)) vay hoang ban cua tre*".