Perhaps you should try some spelling variations:
thuat mach » thuat sach, thuat tach, thuyet mach
mach thoi » cach thoi, cac thoi, sach hoi
dan chong » dan phong, van chuong, dan phuong
thoi tap » toi tap, hoc tap, thoi dai
chong co » cong co, thong co, khong co
nhan van » nhan va, phan van, nha van
nhan dan » phan dau, gian dan, nhan tai
cuu mon » cuu mo, cuu mot, cuu cong
mon hoc » toan hoc, dong hoc
hai van » thai van, ha van, hai tan
xa hai » xa thai, xua hai, xa hoi
co xa » cho xa, co xua, co 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 mach thoi tap, nghien cuu mon hoc dan chong co xa hai van ((nhan van) or (nhan dan))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat mach thoi tap, nghien cuu mon hoc dan chong co xa hai van ((nhan van) OR (nhan dan)).
• Adding a wildcard symbol may retrieve word variants: thuat mach thoi tap, nghien cuu mon hoc dan chong co xa hai van ((nhan van) or (nhan dan))*.