Perhaps you should try some spelling variations:
tchinh trong » trinh trong, hinh trong, chinh truong
chinh trong » chinh cong
trong quan » thong quan, tong quan, thong quang
hoc thieu » toc thieu, hoc hien
quan than » quan thanh, qua than, quang thanh
ho chieu » theo chieu, doi chieu, mot chieu
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: ((ho chieu) OR (hoc thieu)) xanh - ((tchinh trong) or (chinh trong)) su dung trong quan than cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((ho chieu) OR (hoc thieu)) xanh - ((tchinh trong) OR (chinh trong)) su dung trong quan than cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((ho chieu) OR (hoc thieu)) xanh - ((tchinh trong) or (chinh trong)) su dung trong quan than cau".
• Adding a wildcard symbol may retrieve word variants: ((ho chieu) OR (hoc thieu)) xanh - ((tchinh trong) or (chinh trong)) su dung trong quan than cau*.