Perhaps you should try some spelling variations:
thien thanh » tien thanh, thi thanh, hien hanh
hanh trinh » canh tranh, hanh chinh
thong cong » trong cong, tong cong, thong thong
hieu manh » chieu xanh, hieu nganh, dieu hanh
thien anh » thien danh, tien anh, thien chanh
trinh ve » trinh he, trinh va, trinh vi
ve thong » he thong, va thong, ve phong
cong dan » cong san, cong tan, huong dan
dan toan » van toan, dan than, manh 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: hoc ((hieu manh) or (((thien anh) OR (thien thanh)))) - hanh trinh ve thong cong dan toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hieu manh) OR (((thien anh) OR (thien thanh)))) - hanh trinh ve thong cong dan toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hieu manh) or (((thien anh) OR (thien thanh)))) - hanh trinh ve thong cong dan toan cau".
• Adding a wildcard symbol may retrieve word variants: hoc ((hieu manh) or (((thien anh) OR (thien thanh)))) - hanh trinh ve thong cong dan toan cau*.