Perhaps you should try some spelling variations:
hoc thieu » toc thieu, hoc hien
trang xay » trang xa, trang va, trinh xay
trong xay » thong xay, trong cac, trong ca
dung cong » dung trong
ho chieu » theo chieu, doi chieu, mot chieu
cong san » cong tac
san van » tan van, luan van, tran van

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