Perhaps you should try some spelling variations:
cong ngang » cong nhan, cong quang, cong lang
hieu manh » chieu xanh, hieu nganh, dieu hanh
tranh cua » doanh cua, manh cua
cua trong » cua truong, cua trung, qua trong
cong vang » cong lang, cong quang, cong san
hoc hieu » hoc thieu, hoc hien, doc hieu
toan ban » van ban

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

• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu manh - canh tranh cua trong ((cong vang) OR (cong ngang)) ((toan tap) OR (toan ban))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hieu manh - canh tranh cua trong ((cong vang) OR (cong ngang)) ((toan tap) or (toan ban))~".
• Adding a wildcard symbol may retrieve word variants: hoc hieu manh - canh tranh cua trong ((cong vang) OR (cong ngang)) ((toan tap) or (toan ban))*.