Perhaps you should try some spelling variations:
nhung cong » thong cong, hang cong, nhung don
dung cong » dung trong
chu sang » chu bang, chieu sang, chuc nang
thu sang » thu hang, thu san, thu bang
chinh va » chinh ta, chinh tai, hanh va
dan chan » dan gian, dan ca, van chat
chan tap » han tap, phan tap, chan ta

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

• Performing a fuzzy search may retrieve terms with similar spellings: theo ((chu sang) or (thu sang)) - hanh chinh va ((nhung cong) OR (dung cong)) dan chan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo ((chu sang) OR (thu sang)) - hanh chinh va ((nhung cong) OR (dung cong)) dan chan tap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo ((chu sang) or (thu sang)) - hanh chinh va ((nhung cong) OR (dung cong)) dan chan tap".
• Adding a wildcard symbol may retrieve word variants: theo ((chu sang) or (thu sang)) - hanh chinh va ((nhung cong) OR (dung cong)) dan chan tap*.