Perhaps you should try some spelling variations:
thien tinh » khien tinh, thien minh, trien tinh
hanh trang » thanh trung, canh tranh, hanh trinh
tien tinh » tien thinh, tien trinh, trien tinh
trang van » tran van, trang va, trong van
ban cong » bang cong, van cong, phan cong
cong dan » cong san, cong tan, huong dan
dan than » dan chan, ban than, van than
than tap » toan tap, han tap, phan 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 ((thien tinh) or (tien tinh)) - hanh trang van ban cong dan than tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thien tinh) OR (tien tinh)) - hanh trang van ban cong dan than tap.
• Adding a wildcard symbol may retrieve word variants: hoc ((thien tinh) or (tien tinh)) - hanh trang van ban cong dan than tap*.