Perhaps you should try some spelling variations:
thuc cach » thuoc sach, truoc cach, thuc hanh
thoi dap » thoi dai, thi dap, thoi dao
dan khoa » dang khoa, da khoa, san khoa
khoa hoc » hoa hoc
tan nhan » tran nhan, tao nhan, van nhan
nhan dan » phan dau, gian dan, nhan tai
hai tan » hai van, hai quan
mo hoc » mon hoc, co hoc
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: thuc cach ((thoi dap) OR (hoi dap)), nghien cuu mo hoc dan khoa hoc xa hai tan nhan dan~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuc cach ((thoi dap) OR (hoi dap)), nghien cuu mo hoc dan khoa hoc xa hai tan nhan dan".
• Adding a wildcard symbol may retrieve word variants: thuc cach ((thoi dap) OR (hoi dap)), nghien cuu mo hoc dan khoa hoc xa hai tan nhan dan*.