Perhaps you should try some spelling variations:
nghien huy » nghien cuu, nguyen huy, nghiep quy
sach hoi » sach doi, sach moi, cach thoi
hoc danh » hoc dan, hoc anh, hoc hanh
danh hoa » thanh hoa, khanh hoa, nganh hoa
gian dan » gian lang
nhan tai » hang tai, van tai, toan tai
te sach » toc sach
hoi tap » hoi dap, hoc tap, hoi tai
huy mot » huu mot, chua mot, huoc mot
mot hoc » mon hoc, mo hoc, mot goc
hoc xa » hoc ma

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 hoi tap, nghien huy mot hoc danh hoa hoc xa hoi va ((gian dan) or (nhan tai))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach hoi tap, nghien huy mot hoc danh hoa hoc xa hoi va ((gian dan) OR (nhan tai)).
• Adding a wildcard symbol may retrieve word variants: te sach hoi tap, nghien huy mot hoc danh hoa hoc xa hoi va ((gian dan) or (nhan tai))*.