Perhaps you should try some spelling variations:
thien tinh » khien tinh, tien tinh, trien tinh
thien minh » tien minh, trien minh, thien chinh
hanh trinh » canh tranh, hanh chinh
cua thong » cua thuong, cua khong, suat thong
cua tong » cua cong, cua dong, cua nong
cong dan » cong san, cong tan, huong dan
dan phan » doan phan, dan chan, van phan
phan cau » phan dau, phan cac, phan tu

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 tinh) OR (thien minh)) - hanh trinh ((cua thong) or (cua tong)) cong dan phan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thien tinh) OR (thien minh)) - hanh trinh ((cua thong) OR (cua tong)) cong dan phan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((thien tinh) OR (thien minh)) - hanh trinh ((cua thong) or (cua tong)) cong dan phan cau".
• Adding a wildcard symbol may retrieve word variants: hoc ((thien tinh) OR (thien minh)) - hanh trinh ((cua thong) or (cua tong)) cong dan phan cau*.