Perhaps you should try some spelling variations:
thien tinh » khien tinh, thien minh, tien tinh
hanh trinh » canh tranh, hanh chinh
hoc thien » hoc hien, hoc thieu, hoc thiet
cua thong » cua thuong, cua khong, cua tong
cong dan » cong san, cong tan, huong dan
phan cau » phan dau, phan tu, phan lap
phan cac » nhan cach, phan dau, phan lap

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