Perhaps you should try some spelling variations:
van hang » van khang, van hoang, van thang
te sach » toc sach
so sach » so sanh, bo sach, co sach
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
va hang » va nang, va lang, va hanh
cau tre » cau tren, cau treo, cau tra
di cau » da cau, diem cau
ve am » va am

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 (so sach)) ky nang xa hoi. hieu ve am thuc ((va hang) OR (van hang)) di cau tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (so sach)) ky nang xa hoi. hieu ve am thuc ((va hang) OR (van hang)) di cau tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) or (so sach)) ky nang xa hoi. hieu ve am thuc ((va hang) OR (van hang)) di cau tre".
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (so sach)) ky nang xa hoi. hieu ve am thuc ((va hang) OR (van hang)) di cau tre*.