Perhaps you should try some spelling variations:
thuoc cach » thuoc sach, thuc cach, truoc cach
nghien huu » nghien cuu, nguyen huu, nhiem huu
cach tong » cach phong, cach mang, cac cong
hang khoa » dung khoa
tang khoa » dang khoa, tang kha, vang khoa
tong tap » tuong tac, trong tan, cong tac
van luan » van quan, van tuan, von luan
mot hoc » mon hoc, mo hoc, mot goc
huu mot » cuu mot, huy mot, hieu mot
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, nghien huu mot hoc ((tang khoa) OR (hang khoa)) hoc xa hai van luan van~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc cach tong tap, nghien huu mot hoc ((tang khoa) OR (hang khoa)) hoc xa hai van luan van*".