Perhaps you should try some spelling variations:
khien bach » vien bach, khien bang, thien hach
bach xuc » bach tuoc, bach xuan, bach hue
van hang » van khang, van hoang, van thang
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
lang xa » lang ha, dang xay, lang van
xuc van » duc van, luc van, vuc van
cuu tre » cau tren, cau treo
cua tre » cua te, cua triet, dua tren

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) or (nang x)) hoi. dieu khien bach xuc van hang va ((cuu tre) OR (cua tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky ((lang xa) OR (nang x)) hoi. dieu khien bach xuc van hang va ((cuu tre) OR (cua tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky ((lang xa) or (nang x)) hoi. dieu khien bach xuc van hang va ((cuu tre) OR (cua tre))".
• Adding a wildcard symbol may retrieve word variants: su sach ky ((lang xa) or (nang x)) hoi. dieu khien bach xuc van hang va ((cuu tre) OR (cua tre))*.