Perhaps you should try some spelling variations:
hanh trinh » canh tranh, hanh chinh
chieu xanh » chieu sach, chieu sang, chieu tinh
hieu manh » hieu nganh, dieu hanh, hien hanh
trinh qua » trinh quan, trinh cua, trinh quang
trong van » trong cac
qua dung » quang dung, su dung, qua song
toan tap » toan ban
tan tat » ban tat, toan tai, tan tran

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

• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hieu manh) OR (chieu xanh)) - hanh trinh qua dung trong van ((tan tat) OR (toan tap))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hieu manh) or (chieu xanh)) - hanh trinh qua dung trong van ((tan tat) OR (toan tap))~".
• Adding a wildcard symbol may retrieve word variants: hoc ((hieu manh) or (chieu xanh)) - hanh trinh qua dung trong van ((tan tat) OR (toan tap))*.