Perhaps you should try some spelling variations:
thanh trung » thanh tung
dong phuong » duong phuong, dung phuong, dong huong
phuong tinh » phuong trinh, phuong binh, khuong tinh
hieu quang » thieu quang, hieu quan, hieu qua
trung chua » trung cua, trong chuan, trung ha
hieu sang » chieu sang, hieu lang, nhieu tang
chua dong » cua dong, ha dong, huy dong
toan tap » toan ban

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc ((hieu sang) or (hieu quang)) - thanh trung chua dong phuong tinh toan tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc ((hieu sang) OR (hieu quang)) - thanh trung chua dong phuong tinh toan tap.
• Adding a wildcard symbol may retrieve word variants: doc ((hieu sang) or (hieu quang)) - thanh trung chua dong phuong tinh toan tap*.