Perhaps you should try some spelling variations:
hien quang » dien quang, bien quang, hien quan
canh trinh » canh tranh, hanh trinh, canh tinh
danh thanh » dinh thanh, dang thanh, nhanh thanh
trinh qua » trinh quan, trinh cua, trinh quang
qua trong » quan trong, qua trinh, qua song
ban thanh » ban hanh, ban hang

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc hien quang - canh trinh qua trong cong ((ban thanh) or (danh thanh)) lap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien quang - canh trinh qua trong cong ((ban thanh) OR (danh thanh)) lap.
• Adding a wildcard symbol may retrieve word variants: hoc hien quang - canh trinh qua trong cong ((ban thanh) or (danh thanh)) lap*.