Perhaps you should try some spelling variations:
khien tinh » thien tinh, khien thich, dien tinh
thanh tung » thanh cong
bien tinh » yen tinh, diep tinh, ban tinh
dung cong » dung trong
tung qua » dung qua, tuong quan, trung quan
qua dung » quang dung, su dung, qua song
cong tan » cong tac, cong san, cong thanh
tan toan » tan tran, tap toan, van toan
toan cau » toan cao, toan ban, toan tap
bi tinh » vi tinh

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((khien tinh) or (((bien tinh) OR (bi tinh)))) - thanh tung qua dung cong tan toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((khien tinh) OR (((bien tinh) OR (bi tinh)))) - thanh tung qua dung cong tan toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((khien tinh) or (((bien tinh) OR (bi tinh)))) - thanh tung qua dung cong tan toan cau".
• Adding a wildcard symbol may retrieve word variants: hoc ((khien tinh) or (((bien tinh) OR (bi tinh)))) - thanh tung qua dung cong tan toan cau*.