Perhaps you should try some spelling variations:
hien nhanh » hien hanh, thien thanh, tien thanh
canh trinh » canh tranh, hanh trinh, canh tinh
hoan thanh » hoang thanh, ban thanh, van thanh
hoa thanh » ha thanh, hoc thanh, hoang thanh
cong dan » cong san, cong tan, huong dan
than cap » khan cap, thanh lap, thanh cac
khan ap » khan cap, han ap, khan dam

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: hoc hien nhanh - canh trinh ((hoa thanh) OR (hoan thanh)) cong dan ((khan ap) or (than cap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien nhanh - canh trinh ((hoa thanh) OR (hoan thanh)) cong dan ((khan ap) OR (than cap)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hien nhanh - canh trinh ((hoa thanh) OR (hoan thanh)) cong dan ((khan ap) or (than cap))".
• Adding a wildcard symbol may retrieve word variants: hoc hien nhanh - canh trinh ((hoa thanh) OR (hoan thanh)) cong dan ((khan ap) or (than cap))*.