Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
hieu van » hieu va, thien van, hieu ve
van hanh » ban hanh, van anh, van ban
te sach » toc sach
nang xa » nang x, lang xa, nang ma
hau luc » hau loc, cau luc, nhan luc
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
te cua » tue cua, le cua, de 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 y nang xa hoi. ((hieu van) OR (lieu va)) hau luc ((van hanh) or (van thanh)) te cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach y nang xa hoi. ((hieu van) OR (lieu va)) hau luc ((van hanh) OR (van thanh)) te cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach y nang xa hoi. ((hieu van) OR (lieu va)) hau luc ((van hanh) or (van thanh)) te cua tre".
• Adding a wildcard symbol may retrieve word variants: te sach y nang xa hoi. ((hieu van) OR (lieu va)) hau luc ((van hanh) or (van thanh)) te cua tre*.