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
tong tap » tuong tac, trong tan, cong tac
dan khoa » dang khoa, da khoa, san khoa
tan luan » tang luan, toan luan, dan luan
huu mot » cuu mot, huy mot, hieu mot
mot hoc » mon hoc, mo hoc, mot goc
hoi tan » hoi dan, hoi tai, hai tan

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 dan khoa ((hoc xa) or (hoc ma)) hoi tan luan van~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc cach tong tap, nghien huu mot hoc dan khoa ((hoc xa) OR (hoc ma)) hoi tan luan van.
• Adding a wildcard symbol may retrieve word variants: thuoc cach tong tap, nghien huu mot hoc dan khoa ((hoc xa) or (hoc ma)) hoi tan luan van*.