Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
van pham » san pham, van phan, van phat
hanh vai » hanh vi, hanh va, hanh tai
tru tai » tu tai
nang xa » nang x, lang xa, nang ma
va hanh » van hanh, va thanh, va danh
tai ky » thai ky, trai ky, sai ky
cua tu » cua tuc, cua su, cua vu
cua cu » cua chu, cua cau, cua su

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

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