Perhaps you should try some spelling variations:
tuyen quang » nguyen quang, tuyen dung, tuyen duong
thanh trung » thanh tung
phuong cong » phuong dong, phong cong, phung cong
cua phuong » cuu phuong, cuc phuong, luan phuong
bang khoan » hang khoa, bang nhan, dang khoa
thien van » thi van
trung cua » truong cua, trung tuan, trung cap
cong bang » cuong bang, dong bang, hong bang
khoan cam » khoa cam, khoan va, phan cam

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((thien van) or (tuyen quang)) - thanh trung cua phuong cong bang khoan cam~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((thien van) OR (tuyen quang)) - thanh trung cua phuong cong bang khoan cam.
• Adding a wildcard symbol may retrieve word variants: hoc ((thien van) or (tuyen quang)) - thanh trung cua phuong cong bang khoan cam*.