Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
trinh quan » tinh quang, trinh luat, trinh han
tong cong » trong cong, cong cong, dang cong
dung cong » dung trong
hoc diep » hoc dieu, hong diep, ngoc diep
toan cau » toan cao, toan tap, toan tai
toan ban » van ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc diep tinh - hanh trinh quan ((tong cong) or (dung cong)) san ((toan cau) or (toan ban))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc diep tinh - hanh trinh quan ((tong cong) OR (dung cong)) san ((toan cau) OR (toan ban)).
• Adding a wildcard symbol may retrieve word variants: hoc diep tinh - hanh trinh quan ((tong cong) or (dung cong)) san ((toan cau) or (toan ban))*.