Perhaps you should try some spelling variations:
van phan » van phong, van thanh, luan phan
dieu cua » dieu tra
trai ky » thai ky
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
cau duc » cao duc, cau luc, chu duc
van han » van hanh, van nhan, van hoan
cua tre » cua te, cuu tre, cua triet
tai ky » thai ky, sai ky, dai ky
ve cau » ke cau, va cau, ve cac

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: te ((tai ky) OR (trai ky)) nang xa hoi. hieu ve cau duc ((van han) OR (van phan)) dieu cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((tai ky) or (trai ky)) nang xa hoi. hieu ve cau duc ((van han) OR (van phan)) dieu cua tre~".
• Adding a wildcard symbol may retrieve word variants: te ((tai ky) or (trai ky)) nang xa hoi. hieu ve cau duc ((van han) OR (van phan)) dieu cua tre*.