Perhaps you should try some spelling variations:
thuoc cach » thuoc sach, thuc cach, truoc cach
cach tong » cach phong, cach mang, cac cong
hang khoa » dung khoa
tong tap » tuong tac, trong tan, cong tac
hoc hang » hoc hanh, hoc bang, hoc tang
hai quan » tac quan
huu mot » cuu mot, huy mot, hieu mot
mot hoc » mon hoc, mo hoc, mot goc
luan » lan

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