Perhaps you should try some spelling variations:
van toan » van tuan, van thanh, manh toan
hieu van » hieu va, thien van, lieu va
te sach » toc sach
sach ty » sach y, sach tu, sach thu
van tan » van tuan, van ban, van tai
cua tre » cua te, cuu tre, cua triet
cau luc » cau phuc
nang xa » nang x, lang xa, nang ma
ty nang » ky nang, ty xang, ty hang
va cua » va chua, via cua, ca cua

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 ty nang xa hoi. hieu van ((cau luc) OR (cau truc)) ((van toan) or (van tan)) va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ty nang xa hoi. hieu van ((cau luc) OR (cau truc)) ((van toan) OR (van tan)) va cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ty nang xa hoi. hieu van ((cau luc) OR (cau truc)) ((van toan) or (van tan)) va cua tre*".