Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
nganh khoa » nganh hoa, nganh khong, doanh khoa
hoc nganh » hoc nhanh
khoa hoc » hoa hoc
phan dau » phan tu, hang dau
tu sach » thu sach, su sach, te sach
cuu mot » cua mot, cuu mo, huu mot
mot hoc » mon hoc, mo hoc, mot goc
va phan » van phan, va phat, va phap
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) or (thuoc sach)) hoc tap, nghien cuu mot hoc nganh khoa hoc xa hoi va phan dau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thuoc sach)) hoc tap, nghien cuu mot hoc nganh khoa hoc xa hoi va phan dau.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thuoc sach)) hoc tap, nghien cuu mot hoc nganh khoa hoc xa hoi va phan dau*.