Perhaps you should try some spelling variations:
sach thoi » cach thoi, sach hoi, sach tham
thoi tap » toi tap, hoc tap, thoi dai
hoc danh » hoc anh, hoc hanh, hoc nganh
khoa hoc » hoa hoc
te sach » toc sach
nhan va » nhan tai, nhan dan, nhan tao
hoc xa » hoc ma
hoi ca » hoi cua, hoi cac, hoi cau

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach thoi tap, nghien cuu mo ((hoc danh) or (hoc dan)) khoa hoc xa hoi ca nhan va~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach thoi tap, nghien cuu mo ((hoc danh) OR (hoc dan)) khoa hoc xa hoi ca nhan va.
• Adding a wildcard symbol may retrieve word variants: te sach thoi tap, nghien cuu mo ((hoc danh) or (hoc dan)) khoa hoc xa hoi ca nhan va*.