Perhaps you should try some spelling variations:
dien khanh » dien thanh, hien khanh, dieu hanh
hien hanh » dieu hanh
anh quang » anh xquang, anh quan, nhanh quang
cong vang » cong lang, cong quang, cong ngang
quang va » quang van, quan va, quang ma
cong san » cong tac
toan cau » toan cao, toan ban, toan tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((dien khanh) or (hien hanh)) - anh quang va nhung ((cong vang) or (cong san)) toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((dien khanh) OR (hien hanh)) - anh quang va nhung ((cong vang) OR (cong san)) toan cau.
• Adding a wildcard symbol may retrieve word variants: hoc ((dien khanh) or (hien hanh)) - anh quang va nhung ((cong vang) or (cong san)) toan cau*.