Perhaps you should try some spelling variations:
thong trong » thuong trong, thong thong, thong thuong
hieu quang » thieu quang, hieu quan, hieu qua
hieu lang » chieu sang, nhieu tang, hieu van
chinh ca » chinh ta, chinh va, chinh tai
ca thong » ca thuong, va thong, ca trong
tap quan » tac quan, hai quan
bai toan » bai tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: doi ((hieu lang) or (hieu quang)) - hanh chinh ca thong trong ((tap quan) or (bai toan)) ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doi ((hieu lang) OR (hieu quang)) - hanh chinh ca thong trong ((tap quan) OR (bai toan)) ban.
• Adding a wildcard symbol may retrieve word variants: doi ((hieu lang) or (hieu quang)) - hanh chinh ca thong trong ((tap quan) or (bai toan)) ban*.