Perhaps you should try some spelling variations:
sach hoc » cach hoc, sach hoi, mach hoc
cuu tong » cuu cong, cuu tinh, huu tung
luc ngan » luc nganh, luc nhan, luat ngan
khoa hoc » hoa hoc
nhan tai » hang tai, van tai, toan tai
te sach » toc sach
va nhan » van nhan, ca nhan, va phan
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 hoc tap, nghien cuu tong ((luc canh) or (luc ngan)) khoa hoc xa hoi va nhan tai~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach hoc tap, nghien cuu tong ((luc canh) OR (luc ngan)) khoa hoc xa hoi va nhan tai.
• Adding a wildcard symbol may retrieve word variants: te sach hoc tap, nghien cuu tong ((luc canh) or (luc ngan)) khoa hoc xa hoi va nhan tai*.