Perhaps you should try some spelling variations:
dieu hien » dieu khien, dieu kien, dien bien
bach tuoc » sach duoc, sach nuoc
bieu hien » dieu khien, bien phien, bien nien
nang xa » nang x, lang xa, nang ma
tuoc va » thuoc va, nuoc va, duoc va
va danh » va dinh, va dan, va hanh
tu hoai » thu hoai, thi hoai, thu hoan
sac ky » cac ky, sai ky
tu hoa » tu khoa, tuy hoa, tu hoc
su sac » su sach, su cac, su xac

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sac ky nang xa hoi. ((bieu hien) or (dieu hien)) bach tuoc va danh ((tu hoa) OR (tu hoai)) viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sac ky nang xa hoi. ((bieu hien) OR (dieu hien)) bach tuoc va danh ((tu hoa) OR (tu hoai)) viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sac ky nang xa hoi. ((bieu hien) or (dieu hien)) bach tuoc va danh ((tu hoa) OR (tu hoai)) viet".
• Adding a wildcard symbol may retrieve word variants: su sac ky nang xa hoi. ((bieu hien) or (dieu hien)) bach tuoc va danh ((tu hoa) OR (tu hoai)) viet*.