Perhaps you should try some spelling variations:
trinh chuan » trinh han, trinh quan, trinh phan
tranh chua » tranh cua, tranh chap, trinh chu
trinh luan » trinh luat, trinh quan, trinh han
hieu lang » chieu sang, hieu quang, nhieu tang
dong cong » duong cong, dung cong, dang cong
cong hach » cong sach, cong thanh, cong khanh
hach toan » thanh toan, manh toan
toan cau » toan cao, toan ban, toan tap
ho hieu » ho chieu, hoi hieu, nho hieu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho hieu lang - canh ((tranh chua) or (((trinh chuan) OR (trinh luan)))) dong cong hach toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ho hieu lang - canh ((tranh chua) OR (((trinh chuan) OR (trinh luan)))) dong cong hach toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho hieu lang - canh ((tranh chua) or (((trinh chuan) OR (trinh luan)))) dong cong hach toan cau".
• Adding a wildcard symbol may retrieve word variants: ho hieu lang - canh ((tranh chua) or (((trinh chuan) OR (trinh luan)))) dong cong hach toan cau*.