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
vai cua » dai cua, hai cua, lai cua
va hanh » van hanh, va thanh, va danh
sach ky » sac ky, sach y, sach ty
su sach » so sach, vu sach
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
cac lo » cac lop, cac bo, cac ho
cac co » cac cong
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: su sach ky lang xa hoi. ((hieu hien) or (dieu hien)) ((cac lo) OR (cac co)) 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) OR (cac co)) va hanh vai cua tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky lang xa hoi. ((hieu hien) or (dieu hien)) ((cac lo) OR (cac co)) 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) OR (cac co)) va hanh vai cua tu*.