Perhaps you should try some spelling variations:
thien chanh » thien thanh, thien chinh, hien hanh
thien danh » thien anh, thien dang, thien thanh
hanh trinh » canh tranh, hanh chinh
trinh va » trinh van, trinh vat, trinh ve
cong dan » cong san, cong tan, cong dong
toan cao » toan ban, toan tap
va dung » van dung, va duong, vat dung

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((thien danh) or (thien chanh)) - hanh trinh va dung ((cong dan) OR (huong dan)) toan cao~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thien danh) OR (thien chanh)) - hanh trinh va dung ((cong dan) OR (huong dan)) toan cao.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thien danh) or (thien chanh)) - hanh trinh va dung ((cong dan) OR (huong dan)) toan cao".
• Adding a wildcard symbol may retrieve word variants: hoc ((thien danh) or (thien chanh)) - hanh trinh va dung ((cong dan) OR (huong dan)) toan cao*.