Perhaps you should try some spelling variations:
dieu kien » dieu khien, dien bien
hieu vien » hieu hien, hieu viec, thieu nien
tu sach » thu sach, su sach, te sach
hang di » hang doi, hang vi, hang dien
va hang » van hang, va nang, va lang
cac dac » cac dan, cac dai, cac bac
cac tac » cac toc, cac bac, cac tai
sach ky » sac ky, sach y, sach ty
di cua » dai cua, doi cua, de cua
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ky nang x ho. ((hieu vien) or (dieu kien)) ((cac tac) OR (cac dac)) va hang di cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang x ho. ((hieu vien) OR (dieu kien)) ((cac tac) OR (cac dac)) va hang di cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang x ho. ((hieu vien) or (dieu kien)) ((cac tac) OR (cac dac)) va hang di cua te".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang x ho. ((hieu vien) or (dieu kien)) ((cac tac) OR (cac dac)) va hang di cua te*.