Perhaps you should try some spelling variations:
nghien cua » nghien cuu, nghiep cua, nghiep vua
nganh dong » nhanh dong, nganh nong, nganh khong
nganh cong » nhanh chong, thanh cong
thu sach » tu sach, thuat sach, thuoc sach
sach doi » sach hoi, sach moi, sach dao
thuoc va » thuc va, thuoc ma, thuong va
nhan van » nhan dan, nhan va, phan van
doi tap » doi tac, doi dap, doi tai
mot hoc » mon hoc, mo hoc, mot goc
va hoi » xa hoi, va hoc, va hoa
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: thu sach doi tap, nghien cua mot hoc ((nganh dong) or (nganh cong)) thuoc va hoi ca nhan van~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach doi tap, nghien cua mot hoc ((nganh dong) OR (nganh cong)) thuoc va hoi ca nhan van*.