Perhaps you should try some spelling variations:
hoc nhanh » hoc phan
sach doi » sach hoi, sach moi, sach dao
cuu dong » cuu cong, cuu tong, cuu long
khoa hoc » hoa hoc
van nhan » van phan, van thanh, danh nhan
nhan dan » phan dau, gian dan, nhan tai
tu sach » thu sach, su sach, te sach
doi tai » hoi tai, dai tai, doi tac
hai van » thai van, ha van, hai tan
ma hai » ta hai, va hai, xa hai

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 tai, nghien cuu dong ((hoc nganh) or (hoc nhanh)) khoa hoc ma hai van nhan dan~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach doi tai, nghien cuu dong ((hoc nganh) OR (hoc nhanh)) khoa hoc ma hai van nhan dan.
• Adding a wildcard symbol may retrieve word variants: tu sach doi tai, nghien cuu dong ((hoc nganh) or (hoc nhanh)) khoa hoc ma hai van nhan dan*.