Perhaps you should try some spelling variations:
trinh quang » tinh quang, trinh quan, tranh quang
trinh qua » trinh quan, trinh cua, trinh luat
dung cong » dung trong
ho chieu » theo chieu, hoc thieu, doi chieu
cong dan » cong san, cong tan, huong dan
dan toan » van toan, dan than, manh toan
toan cau » toan cao, toan ban, toan tap

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) or (ho chieu)) xanh - hanh ((trinh qua) OR (trinh quang)) dung cong dan toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((theo tieu) OR (ho chieu)) xanh - hanh ((trinh qua) OR (trinh quang)) dung cong dan toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((theo tieu) or (ho chieu)) xanh - hanh ((trinh qua) OR (trinh quang)) dung cong dan toan cau".
• Adding a wildcard symbol may retrieve word variants: ((theo tieu) or (ho chieu)) xanh - hanh ((trinh qua) OR (trinh quang)) dung cong dan toan cau*.