Perhaps you should try some spelling variations:
thieu tinh » trieu tinh, chieu tinh, thien tinh
hanh trinh » canh tranh, hanh chinh
hoc thieu » toc thieu, hoc hien
trinh va » trinh van, trinh vat, trinh ve
cong dan » cong tan, huong dan, cong dong
cong san » cong tac
than cau » phan cau, than cap, thanh chau
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 thieu tinh - hanh trinh va nhung ((cong dan) OR (cong san)) ((than cau) or (toan cau))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu tinh - hanh trinh va nhung ((cong dan) OR (cong san)) ((than cau) OR (toan cau)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu tinh - hanh trinh va nhung ((cong dan) OR (cong san)) ((than cau) or (toan cau))".
• Adding a wildcard symbol may retrieve word variants: hoc thieu tinh - hanh trinh va nhung ((cong dan) OR (cong san)) ((than cau) or (toan cau))*.