Perhaps you should try some spelling variations:
chieu tinh » trieu tinh, lieu tinh, chau tinh
thanh tung » thanh cong
hieu manh » chieu xanh, hieu nganh, dieu hanh
dung cong » dung trong
tung qua » dung qua, tuong quan, trung quan
qua dung » quang dung, su dung, qua song
cong hai » cong thai, cong ha, hoang hai
hai toan » bai toan, hai tan, hach toan
toan cau » toan cao, toan ban, toan tap

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((hieu manh) OR (chieu tinh)) - thanh tung qua dung cong hai toan cau~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hieu manh) OR (chieu tinh)) - thanh tung qua dung cong hai toan cau".
• Adding a wildcard symbol may retrieve word variants: hoc ((hieu manh) OR (chieu tinh)) - thanh tung qua dung cong hai toan cau*.