Perhaps you should try some spelling variations:
thien van » thi van
hieu van » hieu va, lieu va, hieu ve
van tuan » van quan, van ban, anh tuan
te sach » toc sach
cac toc » cac toi, cac nuoc, cac thoi
tuan vi » quan vi, luan vi, quans vi
cac tuc » cac tu, cac tac, cac nuoc
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
cua tre » cua te, cuu tre, cua triet
vi cua » vai cua, di 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 ky nang xa hoi. ((hieu van) OR (thien van)) ((cac tuc) or (cac toc)) van tuan vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky nang xa hoi. ((hieu van) OR (thien van)) ((cac tuc) OR (cac toc)) van tuan vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky nang xa hoi. ((hieu van) OR (thien van)) ((cac tuc) or (cac toc)) van tuan vi cua tre".
• Adding a wildcard symbol may retrieve word variants: te sach ky nang xa hoi. ((hieu van) OR (thien van)) ((cac tuc) or (cac toc)) van tuan vi cua tre*.