Perhaps you should try some spelling variations:
luan chung » luan chinh
hoc thieu » toc thieu, hoc hien
tac dung » sach dung, xay dung, tin dung
luan ung » luan hung, luon ung, luan luong
cong sat » cong suat, cong san, cong hat
sat phan » sat nhan, vat phan, xuat phan
phan dau » phan tu, hang dau

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((hoc thieu) or (theo tieu)) xanh - tac dung ((luan chung) or (luan ung)) cong sat phan dau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc thieu) OR (theo tieu)) xanh - tac dung ((luan chung) OR (luan ung)) cong sat phan dau.
• Adding a wildcard symbol may retrieve word variants: ((hoc thieu) or (theo tieu)) xanh - tac dung ((luan chung) or (luan ung)) cong sat phan dau*.