Perhaps you should try some spelling variations:
nganh khoa » nganh hoa, nganh khong, doanh khoa
sach doi » sach hoi, sach moi, sach dao
khoa hoc » hoa hoc
tu sach » thu sach, su sach, te sach
doi tap » doi tac, doi dap, doi tai
mot hoc » mon hoc, mot goc, bot hoc
va luan » vay luan, van luan, va quan
mo hoc » mon hoc, co hoc
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: tu sach doi tap, nghien cuu ((mot hoc) or (mo hoc)) nganh khoa hoc xa hoi va luan van~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach doi tap, nghien cuu ((mot hoc) OR (mo hoc)) nganh khoa hoc xa hoi va luan van.
• Adding a wildcard symbol may retrieve word variants: tu sach doi tap, nghien cuu ((mot hoc) or (mo hoc)) nganh khoa hoc xa hoi va luan van*.