Perhaps you should try some spelling variations:
thieu quang » hieu quang, thien quan, trien quang
thanh phan » thanh pho, thanh san, thanh toan
thong cong » trong cong, tong cong, thong thong
vien quan » lien quan, van quan, tin quan
cong benh » con benh, cong binh, song benh
hanh han » hanh nhan, hanh phan, hanh san
va thong » va thuong, va phuong, he thong
benh van » benh va, menh van, benh man
van tai » von tai, van tuan

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 quang) or (vien quan)) - ((hanh han) or (thanh phan)) va thong cong benh van tai~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thieu quang) OR (vien quan)) - ((hanh han) OR (thanh phan)) va thong cong benh van tai.
• Adding a wildcard symbol may retrieve word variants: hoc ((thieu quang) or (vien quan)) - ((hanh han) or (thanh phan)) va thong cong benh van tai*.