Perhaps you should try some spelling variations:
dieu hien » dieu khien, dieu kien, bieu hien
hieu vien » hieu hien, hieu viec, thieu nien
thu sach » tu sach, thuat sach, thuoc sach
sach ky » sac ky, sach y, sach ty
cac tac » cac toc, cac bac, cac dac
va hang » van hang, va nang, va lang
hang vi » hang va, hanh vi, hang di
tac va » tac da, tac xa, tuc va
vi cua » vai cua, di 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: thu sach ky nang x ho. ((hieu vien) OR (dieu hien)) cac tac va hang vi cua te~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky nang x ho. ((hieu vien) OR (dieu hien)) cac tac va hang vi cua te".
• Adding a wildcard symbol may retrieve word variants: thu sach ky nang x ho. ((hieu vien) OR (dieu hien)) cac tac va hang vi cua te*.