Perhaps you should try some spelling variations:
trinh quan » trinh luat, trinh han
hoc thieu » toc thieu, hoc hien
tong cong » trong cong, cong cong, dung cong
theo chu » theo chieu, cho chu, chao chu
cong san » cong tac
san than » sang than, san thanh, ban than
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: ((hoc thieu) or (theo chu)) xanh - hanh ((trinh quan) OR (tinh quang)) tong cong san than cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc thieu) OR (theo chu)) xanh - hanh ((trinh quan) OR (tinh quang)) tong cong san than cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc thieu) or (theo chu)) xanh - hanh ((trinh quan) OR (tinh quang)) tong cong san than cau".
• Adding a wildcard symbol may retrieve word variants: ((hoc thieu) or (theo chu)) xanh - hanh ((trinh quan) OR (tinh quang)) tong cong san than cau*.