Perhaps you should try some spelling variations:
thong cong » trong cong, tong cong, thong thong
hieu manh » chieu xanh, hieu nganh, dieu hanh
lang toan » lang thang, lang thanh, quang toan
dang toan » dang tran, dan toan, dung toan
hoc hieu » hoc thieu, hoc hien, doc hieu
tranh he » trinh he, tranh ha, tinh he

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 manh - canh tranh he thong cong ((lang toan) or (dang toan)) ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hieu manh - canh tranh he thong cong ((lang toan) OR (dang toan)) ban.
• Adding a wildcard symbol may retrieve word variants: hoc hieu manh - canh tranh he thong cong ((lang toan) or (dang toan)) ban*.