Perhaps you should try some spelling variations:
chinh sua » chinh su, chinh cua, chinh luan
thong den » thong dien, thong dan, tuong den
chi sang » chi lang, chieu sang, chi chang
chinh ta » chinh tai, chinh va, chinh tri
den toan » dien toan, dan toan, den tran
toan ban » van ban
doi chi » doi khi

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi chi sang - hanh ((chinh sua) or (chinh ta)) thong thong den toan ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi chi sang - hanh ((chinh sua) OR (chinh ta)) thong thong den toan ban.
• Adding a wildcard symbol may retrieve word variants: doi chi sang - hanh ((chinh sua) or (chinh ta)) thong thong den toan ban*.