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
thien van » thi van
trung cua » truong cua, trung tuan, trung cap
ban khoan » toan khoan, cac khoan, san khoa
khoan cam » khoa cam, khoan va, phan cam
cong ban » cong bang, cong san, cong tan

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 ban 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 ban khoan cam.
• Adding a wildcard symbol may retrieve word variants: hoc ((thien van) or (tuyen quang)) - thanh trung cua phuong cong ban khoan cam*.