Perhaps you should try some spelling variations:
canh trang » canh tranh, hanh trang, banh trang
hoc thieu » toc thieu, hoc hien
trang thi » trang thai, tran thi, trang tri
dung cong » dung trong
ho chieu » theo chieu, doi chieu, mot chieu
thi dung » thi huong, thi nhung, thi cong
tac toan » tap toan, tam toan, hach toan

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((ho chieu) or (hoc thieu)) xanh - canh trang thi dung cong ((tac toan) or (tinh toan)) cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((ho chieu) OR (hoc thieu)) xanh - canh trang thi dung cong ((tac toan) OR (tinh toan)) cau.
• Adding a wildcard symbol may retrieve word variants: ((ho chieu) or (hoc thieu)) xanh - canh trang thi dung cong ((tac toan) or (tinh toan)) cau*.