Perhaps you should try some spelling variations:
trinh chuan » trinh han, trinh quan, trinh luan
duong quang » dung quang, luong quang, duong qua
tranh chua » tranh cua, tranh chap, trinh chu
cong quang » luong quang, thong quang, dang quang
tieu xanh » tieu danh, chieu xanh, dieu hanh
toan tap » toan ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo tieu xanh - canh ((tranh chua) OR (trinh chuan)) bang ((cong quang) or (duong quang)) toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo tieu xanh - canh ((tranh chua) OR (trinh chuan)) bang ((cong quang) OR (duong quang)) toan tap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo tieu xanh - canh ((tranh chua) OR (trinh chuan)) bang ((cong quang) or (duong quang)) toan tap".
• Adding a wildcard symbol may retrieve word variants: theo tieu xanh - canh ((tranh chua) OR (trinh chuan)) bang ((cong quang) or (duong quang)) toan tap*.