Perhaps you should try some spelling variations:
chieu xanh » chieu sach, chieu sang, chieu tinh
trinh quan » tinh quang, trinh luat, trinh han
trong dong » trong cong, trong nong, trong dang
trinh qua » trinh cua, trinh quang, trinh luat
dong than » dong thanh, dong thuan, dong chan
than tap » toan tap, han tap, phan tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((chieu xanh) or (trieu tinh)) - hanh ((trinh qua) OR (trinh quan)) dung trong dong than tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((chieu xanh) OR (trieu tinh)) - hanh ((trinh qua) OR (trinh quan)) dung trong dong than tap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((chieu xanh) or (trieu tinh)) - hanh ((trinh qua) OR (trinh quan)) dung trong dong than tap".
• Adding a wildcard symbol may retrieve word variants: hoc ((chieu xanh) or (trieu tinh)) - hanh ((trinh qua) OR (trinh quan)) dung trong dong than tap*.