Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
hieu van » hieu va, thien van, lieu va
cua tre » cua te, cuu tre, cua triet
cau duc » cao duc, cau luc, chu duc
hanh de » hanh ve, hanh kem
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va
duc van » duc va, duc tan, duc manh
de cua » le cua, te cua, dieu cua
tai ky » thai ky, trai ky, dai ky
sai ky » sac ky

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

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