Perhaps you should try some spelling variations:
van hang » van khang, van hoang, van thang
hieu van » hieu va, thien van, lieu va
hang vai » hang va, hang tai, hang hai
te sach » toc sach
su sach » so sach, vu sach
cac duc » cao duc, cac dac, cac nuoc
vai cuu » vai cua
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: ((te sach) or (su sach)) ky nang x ho. hieu van ((cac duc) OR (cac du)) van 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 ho. hieu van ((cac duc) OR (cac du)) van 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 ho. hieu van ((cac duc) OR (cac du)) van hang vai cuu tre*".