Perhaps you should try some spelling variations:
thuoc cach » thuoc sach, thuc cach, cuoc cach
truoc cach » cuoc cach, thuc cach, truoc cang
tang khoa » hang khoa, dang khoa, tang kha
tong tap » tuong tac, trong tan, cong tac
hoc tang » hoc bang, hoc tan, hoc tieng
khoa hoc » hoa hoc
van luan » van quan, van tuan, von luan
huu mot » cuu mot, huy mot, hieu mot
mot hoc » mon hoc, mo hoc, mot goc
hoi van » hoi va, hoi dan, hai van
hoc xa » hoc ma

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) OR (truoc cach)) tong tap, nhiem huu mot hoc tang khoa hoc xa hoi van luan van~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thuoc cach) OR (truoc cach)) tong tap, nhiem huu mot hoc tang khoa hoc xa hoi van luan van".
• Adding a wildcard symbol may retrieve word variants: ((thuoc cach) OR (truoc cach)) tong tap, nhiem huu mot hoc tang khoa hoc xa hoi van luan van*.