Perhaps you should try some spelling variations:
thong quang » thong quan, thong qua, luong quang
canh trong » anh trong, hanh trong, lanh trong
trong phan » truong phan, trong phat, thong phan
dung thong » dung thuong, dung trong, dong thong
quang khan » quang khanh, quang khang, quang khai
hieu tinh » chieu tinh, lieu tinh, hieu binh
kieu tinh » lieu tinh, trieu tinh, diep tinh
phan dung » phan ung, phan dang, chan dung
khan cap » khan ap, than cap, khoan cam

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

• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((hieu tinh) OR (kieu tinh)) - canh trong phan dung thong quang khan cap~.
• Adding a wildcard symbol may retrieve word variants: doc ((hieu tinh) or (kieu tinh)) - canh trong phan dung thong quang khan cap*.