Perhaps you should try some spelling variations:
nghien cua » nghien cuu, nghiep cua, nghiep vua
phan khoa » pham khoa, nhan khoa, phan hoa
sach hoc » cach hoc, sach hoi, sach duoc
mach hoc » cach hoc, dich hoc, anh hoc
hoc phan » hoc dan, hoc pho
khoa hoc » hoa hoc
gian dan » gian lang
mot hoc » mon hoc, mo hoc, mot goc
va gian » va gianh, van gian, va giai
ma hoi » mai hoi, xa hoi, ma hoa

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 hoc) or (mach hoc)) tap, nghien cua mot hoc phan khoa hoc ma hoi va gian dan~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach hoc) OR (mach hoc)) tap, nghien cua mot hoc phan khoa hoc ma hoi va gian dan.
• Adding a wildcard symbol may retrieve word variants: tu ((sach hoc) or (mach hoc)) tap, nghien cua mot hoc phan khoa hoc ma hoi va gian dan*.