Perhaps you should try some spelling variations:
nhung cong » dung cong, thong cong, hang cong
hanh tranh » canh tranh, hanh trinh, hanh trang
hieu lang » chieu sang, hieu quang, nhieu tang
tranh cua » doanh cua, manh cua
cua nhung » va nhung
tan thanh » tran thanh, tang thanh, toan thanh
hoc hieu » hoc thieu, hoc hien, doc hieu
tan than » ban than, tam than, van than

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc hieu lang - hanh tranh cua nhung cong ((((tan than) OR (tan thanh))) or (tan tran)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu lang - hanh tranh cua nhung cong ((((tan than) OR (tan thanh))) OR (tan tran)) cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hieu lang - hanh tranh cua nhung cong ((((tan than) OR (tan thanh))) or (tan tran)) cau".
• Adding a wildcard symbol may retrieve word variants: hoc hieu lang - hanh tranh cua nhung cong ((((tan than) OR (tan thanh))) or (tan tran)) cau*.