Perhaps you should try some spelling variations:
khien bang » phien ban, khien dong
thong cong » trong cong, tong cong, thong thong
hien sang » hien trang, chieu sang, thien bang
cong vang » cong lang, cong quang, cong ngang
chinh va » chinh ta, chinh tai, hanh va
va thong » va thuong, va phuong, he thong
vang ban » van ban, hang ban, nang ban
ban tu » van tu

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 sang) OR (khien bang)) - hanh chinh va thong cong vang ban tu~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hien sang) OR (khien bang)) - hanh chinh va thong cong vang ban tu".
• Adding a wildcard symbol may retrieve word variants: hoc ((hien sang) OR (khien bang)) - hanh chinh va thong cong vang ban tu*.