Perhaps you should try some spelling variations:
theo chieu » theo tieu, ho chieu, theo chu
hoc thieu » toc thieu, hoc hien
luan hung » luan chung, lan hung, luan ung
hung cong » nhung cong, hung cuong, phung cong
tac dung » xay dung, tin dung, van dung
cong san » cong tac
san phan » san pham, van phan, sat phan
phan dau » phan tu, hang dau

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: ((hoc thieu) OR (theo chieu)) xanh - ((tac dung) OR (sach dung)) luan hung cong san phan dau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc thieu) or (theo chieu)) xanh - ((tac dung) OR (sach dung)) luan hung cong san phan dau~".
• Adding a wildcard symbol may retrieve word variants: ((hoc thieu) or (theo chieu)) xanh - ((tac dung) OR (sach dung)) luan hung cong san phan dau*.