Perhaps you should try some spelling variations:
hoc thuyet » hoc chuyen
hanh tranh » canh tranh, hanh trinh, hanh trang
hoc thiet » hoc thieu, hoc hien, toc thieu
tranh cua » doanh cua, manh cua
cua trong » cua truong, cua trung, qua trong
dan toan » van toan, manh toan, xuan toan
dan than » dan chan, ban 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 thiet) OR (hoc thuyet)) danh - hanh tranh cua trong cong ((dan toan) or (dan than)) ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc thiet) OR (hoc thuyet)) danh - hanh tranh cua trong cong ((dan toan) OR (dan than)) ban.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc thiet) OR (hoc thuyet)) danh - hanh tranh cua trong cong ((dan toan) or (dan than)) ban".
• Adding a wildcard symbol may retrieve word variants: ((hoc thiet) OR (hoc thuyet)) danh - hanh tranh cua trong cong ((dan toan) or (dan than)) ban*.