Perhaps you should try some spelling variations:
cach thuc » anh thuc, cac thu
cach hoc » cach thoi, dich hoc, cac hop
cuu cong » cua cong, thu cong, cac cong
cong hoc » dong hoc, cong hoa, cong coc
tao gian » thoi gian, tao giong, thao giao
gian dan » gian lang
dan hoa » danh hoa, dan hoat, dan khoa
hai tao » tai tao, hai tan, ai tao
hoc xa » hoc ma
xa hai » xa thai, xua hai, xa hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: truoc ((cach hoc) OR (cach thuc)) dai, nghien cuu cong hoc dan hoa hoc xa hai tao gian dan~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "truoc ((cach hoc) OR (cach thuc)) dai, nghien cuu cong hoc dan hoa hoc xa hai tao gian dan".
• Adding a wildcard symbol may retrieve word variants: truoc ((cach hoc) OR (cach thuc)) dai, nghien cuu cong hoc dan hoa hoc xa hai tao gian dan*.