Perhaps you should try some spelling variations:
thuc cach » thuoc sach, truoc cach, thuc hanh
cach thoi » cac thoi, cach thuc, cach noi
thoi dap » hoi dap, thoi dai, thi dap
hoa toan » hoa tan, hop toan, hoa than
khoa hoc » hoa hoc
nhan dan » phan dau, gian dan, nhan tai
hai van » thai van, hai tan, hao van
mo hoa » mon hoa, do hoa, ma hoa
hoc xa » hoc ma
ha van » hoa van, nha van, va van

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, nghien cuu mo hoa toan khoa hoc xa ((hai van) OR (ha van)) nhan dan~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuc cach thoi dap, nghien cuu mo hoa toan khoa hoc xa ((hai van) OR (ha van)) nhan dan".
• Adding a wildcard symbol may retrieve word variants: thuc cach thoi dap, nghien cuu mo hoa toan khoa hoc xa ((hai van) OR (ha van)) nhan dan*.