Perhaps you should try some spelling variations:
quang dung » quang trung, ung dung, cuong dung
hanh hang » thanh hang, hanh han, hanh mang
hang hang » nang hang, cang thang, hung thang
dung cong » dung trong
cong tac » cong ty
tac than » tac thanh, tam than, tac nhan
than cau » toan cau, phan cau, than cap

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((hoc hien) or (theo tieu)) xanh - ((hanh hang) or (hang hang)) quang dung cong tac than cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc hien) OR (theo tieu)) xanh - ((hanh hang) OR (hang hang)) quang dung cong tac than cau.
• Adding a wildcard symbol may retrieve word variants: ((hoc hien) or (theo tieu)) xanh - ((hanh hang) or (hang hang)) quang dung cong tac than cau*.