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
trai ky » thai ky
nang xa » nang x, lang xa, nang ma
va hanh » van hanh, va thanh, va danh
tai ky » thai ky, sai ky, dai ky
cua tu » cua tuc, cua su, cua cu

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