Perhaps you should try some spelling variations:
phuong cong » phuong dong, phong cong, phung cong
chieu xanh » chieu sach, chieu sang, chieu tinh
thanh tung » thanh cong
va phuong » va thuong, cac phuong
tan khoan » toan khoan, tao khoang, tien khoan
tai khoan » tai khoa, tao khoang, cac khoan
ho chieu » theo chieu, hoc thieu, doi chieu
tung va » trung va, tuong va, dung va

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

• Performing a fuzzy search may retrieve terms with similar spellings: ho chieu xanh - thanh tung va phuong cong ((tan khoan) OR (tai khoan)) cam~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "ho chieu xanh - thanh tung va phuong cong ((tan khoan) OR (tai khoan)) cam".
• Adding a wildcard symbol may retrieve word variants: ho chieu xanh - thanh tung va phuong cong ((tan khoan) OR (tai khoan)) cam*.