Perhaps you should try some spelling variations:
trinh quan » tinh quang, trinh luat
hieu xanh » chieu xanh, hieu manh, hieu nganh
dung cong » dung trong
doc hieu » toc thieu, hoc thieu, hoc hien
cong tan » cong tac, cong san, cong thanh
tan toan » tan tran, tap toan, van 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: doc hieu xanh - hanh ((trinh quan) OR (trinh han)) dung cong tan toan cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc hieu xanh - hanh ((trinh quan) OR (trinh han)) dung cong tan toan cau".
• Adding a wildcard symbol may retrieve word variants: doc hieu xanh - hanh ((trinh quan) OR (trinh han)) dung cong tan toan cau*.