Perhaps you should try some spelling variations:
dieu kien » dieu khien, dien bien
hieu vien » hieu hien, hieu viec, thieu nien
cac tac » cac toc, cac bac, cac dac
va hang » van hang, va nang, va lang
hang di » hang doi, hang vi, hang dien
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai ky
tac va » tac da, tac xa, tuc va
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: tu sac ky nang x ho. ((hieu vien) or (dieu kien)) cac tac va hang di ((cua te) or (cua tu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky nang x ho. ((hieu vien) OR (dieu kien)) cac tac va hang di ((cua te) OR (cua tu)).
• Adding a wildcard symbol may retrieve word variants: tu sac ky nang x ho. ((hieu vien) or (dieu kien)) cac tac va hang di ((cua te) or (cua tu))*.