Perhaps you should try some spelling variations:
hien tinh » khien tinh, thien tinh, bien tinh
chinh cua » chinh ca, hinh cua, chinh luan
chinh sua » chinh su, chinh luan, hinh su
dang cong » dung cong
cong ban » cong bang, cong san, cong tan
than cao » toan cao, thai cao, than sao
than cap » khan cap, thanh lap, thanh cac

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 tinh - hanh ((chinh cua) OR (chinh sua)) dang cong ban ((than cao) or (than cap))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc hien tinh - hanh ((chinh cua) OR (chinh sua)) dang cong ban ((than cao) OR (than cap)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc hien tinh - hanh ((chinh cua) OR (chinh sua)) dang cong ban ((than cao) or (than cap))".
• Adding a wildcard symbol may retrieve word variants: hoc hien tinh - hanh ((chinh cua) OR (chinh sua)) dang cong ban ((than cao) or (than cap))*.