Perhaps you should try some spelling variations:
chieu sach » chinh sach, chiet tach, chieu sang
trang xay » trang xa, trang va, trinh xay
trong xay » thong xay, trong cac, trong ca
dung cong » dung trong
ho chieu » theo chieu, hoc thieu, doi chieu
san van » tan van, tran van, dang van
luan » quan, lan

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: ho chieu sach - hanh ((trang xay) OR (trong xay)) dung cong ((san van) OR (luan van)) ban~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho chieu sach - hanh ((trang xay) or (trong xay)) dung cong ((san van) OR (luan van)) ban~".
• Adding a wildcard symbol may retrieve word variants: ho chieu sach - hanh ((trang xay) or (trong xay)) dung cong ((san van) OR (luan van)) ban*.