Perhaps you should try some spelling variations:
trinh quan » tinh quang, trinh luat, trinh han
nhung cong » dung cong, thong cong, hang cong
hieu lang » chieu sang, hieu quang, nhieu tang
trinh cua » tinh cua, trinh luat, trinh luan
cong van » cong vang, cong san, song van
van toan » van tuan, van tan, van thanh
toan cau » toan cao, toan ban, toan tap
he hieu » he nhieu, he dieu, de hieu

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

• Performing a fuzzy search may retrieve terms with similar spellings: he hieu lang - hanh ((trinh cua) OR (trinh quan)) nhung cong van toan cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "he hieu lang - hanh ((trinh cua) OR (trinh quan)) nhung cong van toan cau".
• Adding a wildcard symbol may retrieve word variants: he hieu lang - hanh ((trinh cua) OR (trinh quan)) nhung cong van toan cau*.