Perhaps you should try some spelling variations:
thanh phan » thanh pho, thanh san, thanh toan
ban thanh » ban hanh, ban hang
hieu van » hieu va, thien van, lieu va
phan cua » nhan cua, than cua, phat cua
nang xa » nang x, lang xa, nang ma
duc ban » duc tan, duc van, dua ban
cua tre » cua te, cuu tre, cua triet
sac ky » sai ky
hieu v » hieu va, hieu ve, hieu 2

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

• Performing a fuzzy search may retrieve terms with similar spellings: su ((sac ky) OR (cac ky)) nang xa hoi. ((hieu v) or (hieu van)) pham duc ban thanh phan cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sac ky) OR (cac ky)) nang xa hoi. ((hieu v) OR (hieu van)) pham duc ban thanh phan cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sac ky) OR (cac ky)) nang xa hoi. ((hieu v) or (hieu van)) pham duc ban thanh phan cua tre".
• Adding a wildcard symbol may retrieve word variants: su ((sac ky) OR (cac ky)) nang xa hoi. ((hieu v) or (hieu van)) pham duc ban thanh phan cua tre*.