Perhaps you should try some spelling variations:
trinh phan » trinh han, trinh quan, thanh phan
hoc nganh » hoc nhanh
nganh hoa » thanh hoa, khanh hoa, danh hoa
thu sach » thuat sach, thuoc sach, thu hoach
cuu toan » cuu hoan, cua toan, huu toan
toan hoc » toan khoa, van hoc, tin hoc
va trinh » van trinh, va tinh, lap trinh
tu sach » su sach, te sach, tu cach
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 (thu sach)) hoc tap, nghien cuu toan hoc nganh hoa hoc xa hoi va trinh phan~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) hoc tap, nghien cuu toan hoc nganh hoa hoc xa hoi va trinh phan.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu sach)) hoc tap, nghien cuu toan hoc nganh hoa hoc xa hoi va trinh phan*.