Perhaps you should try some spelling variations:
canh hoc » anh hoc, danh hoc, canh chuc
cach hoc » cach thuc, cach thoi, dich hoc
van gian » van giang, dan gian, van giao
gian dan » gian lang
dan hoa » danh hoa, dan hoat, dan khoa
hoi van » hoi va, hoi dan, hai van
cuu co » huu co, cua co, cuu mo
hoc xa » hoc ma

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuat ((canh hoc) or (cach hoc)) tap, nghien cuu co hoc dan hoa hoc xa hoi van gian dan~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat ((canh hoc) OR (cach hoc)) tap, nghien cuu co hoc dan hoa hoc xa hoi van gian dan.
• Adding a wildcard symbol may retrieve word variants: thuat ((canh hoc) or (cach hoc)) tap, nghien cuu co hoc dan hoa hoc xa hoi van gian dan*.