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

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

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