Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
sach doi » sach hoi, sach moi, sach dao
hoc danh » hoc dan, hoc hanh, hoc nganh
luan san » luan van, luan hoan, luan phan
doi tac » dong tac
cuu mon » cuu mo, cuu mot, cuu cong
hoc anh » hoc nganh, hoc nhanh, ngoc anh
ma khoa » may khoa, mai khoa, da khoa
san van » tan van, luan van, tran van

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach doi tac, nghien cuu mon ((hoc danh) or (hoc anh)) hoa hoc ma khoa luan san van~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach doi tac, nghien cuu mon ((hoc danh) OR (hoc anh)) hoa hoc ma khoa luan san van.
• Adding a wildcard symbol may retrieve word variants: toc sach doi tac, nghien cuu mon ((hoc danh) or (hoc anh)) hoa hoc ma khoa luan san van*.