Perhaps you should try some spelling variations:
nhung phuong » dung phuong, nhu phuong, truong phuong
chieu tinh » trieu tinh, lieu tinh, chau tinh
ho chieu » theo chieu, hoc thieu, doi chieu
tranh va » tranh van, trang va, trinh va
van toan » van tan, van thanh, manh toan
van tuan » van quan, van ban, anh tuan

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

• The words AND, OR and NOT may confuse the search; try adding quotes: "ho chieu tinh - canh tranh va nhung phuong ((van toan) OR (van tuan)) cao~".
• Adding a wildcard symbol may retrieve word variants: ho chieu tinh - canh tranh va nhung phuong ((van toan) OR (van tuan)) cao*.