Perhaps you should try some spelling variations:
trinh huong » trinh phuong, tinh huong, trinh duong
canh trinh » canh tranh, hanh trinh, canh tinh
huong cong » luong cong, duong cong, cuong cong
khi xanh » khia canh, thi hanh, thi anh
dong tac » cong tac, dong tai, dong bac
tac toan » tap toan, tam toan, hach toan
toan cau » toan cao, toan ban, toan tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi khi xanh - canh trinh huong cong dong tac toan cau~.
• Adding a wildcard symbol may retrieve word variants: doi khi xanh - canh trinh huong cong dong tac toan cau*.