Perhaps you should try some spelling variations:
khien tinh » thien tinh, khien thich, bien tinh
nhung cong » dung cong, thong cong, hang cong
hoc khien » hoc hien, hoc nghien, hoc thieu
tranh cua » doanh cua, manh cua
cua nhung » va nhung
manh toan » thanh toan, anh tuan, tinh toan
san toan » van toan, dan toan, xuan toan

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc khien tinh - canh tranh cua nhung cong ((san toan) or (manh toan)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc khien tinh - canh tranh cua nhung cong ((san toan) OR (manh toan)) cau.
• Adding a wildcard symbol may retrieve word variants: hoc khien tinh - canh tranh cua nhung cong ((san toan) or (manh toan)) cau*.