Perhaps you should try some spelling variations:
thuoc cach » thuoc sach, thuc cach, truoc cach
cach tong » cach phong, cach mang, cac cong
nhiem huy » nhiem huu, nhiem thuc, nhiem cua
tang khoa » hang khoa, dang khoa, tang kha
khoa hoc » hoa hoc
hoc tang » hoc bang, hoc tan, hoc tieng
van luan » van quan, van tuan, von luan
nhiem ky » hiem y, hieu ky, nhiem va
tong tap » tuong tac, trong tan, cong tac
mot hoc » mon hoc, mo hoc, mot goc
hai van » thai van, ha van, hai tan
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: thuoc cach tong tap, ((nhiem huy) or (nhiem ky)) mot hoc tang khoa hoc xa hai van luan van~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc cach tong tap, ((nhiem huy) OR (nhiem ky)) mot hoc tang khoa hoc xa hai van luan van.
• Adding a wildcard symbol may retrieve word variants: thuoc cach tong tap, ((nhiem huy) or (nhiem ky)) mot hoc tang khoa hoc xa hai van luan van*.