Perhaps you should try some spelling variations:
thieu khang » chieu khong, thieu quang
hieu quang » thieu quang, hieu quan, hieu qua
hung thang » cang thang, hung tran
tong cong » trong cong, cong cong, dung cong
cong luan » tong luan, cong tuan, dong luan
thang va » hang va, trang va, thong va
va tong » va thong, va tuong, va trong

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 (hieu quang)) - hung thang va tong cong luan van ban~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu khang) OR (hieu quang)) - hung thang va tong cong luan van ban.
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu khang) or (hieu quang)) - hung thang va tong cong luan van ban*.