Perhaps you should try some spelling variations:
dieu hien » dieu khien, dieu kien, bieu hien
hieu hien » bieu hien, chieu chien, dieu khien
hanh vai » hanh vi, hanh va, hanh tai
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
va hanh » van hanh, va thanh, va danh
vai cua » dai cua, hai cua, lai cua
cac lo » cac lop, cac co, cac bo
cua tu » cua tuc, cua su, cua cu
lo va » lo van, lao va, ly va

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ky lang xa hoi. ((hieu hien) or (dieu hien)) cac lo va hanh vai cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky lang xa hoi. ((hieu hien) OR (dieu hien)) cac lo va hanh vai cua tu.
• Adding a wildcard symbol may retrieve word variants: su sach ky lang xa hoi. ((hieu hien) or (dieu hien)) cac lo va hanh vai cua tu*.