Perhaps you should try some spelling variations:
thieu khang » chieu khong, thieu quang
chieu sang » chieu sach, chieu xanh, hieu lang
nhung cong » dung cong, thong cong, hang cong
chinh va » chinh ta, chinh tai, hanh va
cong van » cong vang, cong san, song van
tuan tap » toan tap, tuan tai, toan tai

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

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