Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
nghien huu » nghien cuu, nguyen huu, nhiem huu
sach hoc » cach hoc, sach hoi, mach hoc
tung hoc » trung hoc, tuong hoc, dung hoc
hoc phan » hoc dan, hoc pho
phan hoa » phan loai, phan phoi, phan hong
dan nhan » danh nhan, dan chan, van nhan
nhan tai » hang tai, van tai, toan tai
hoi dan » hoa dan, hoc dan, hoi dap

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: thuat sach hoc tap, nghien huu tung hoc phan hoa ((hoc xa) or (hoc ma)) hoi dan nhan tai~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach hoc tap, nghien huu tung hoc phan hoa ((hoc xa) OR (hoc ma)) hoi dan nhan tai.
• Adding a wildcard symbol may retrieve word variants: thuat sach hoc tap, nghien huu tung hoc phan hoa ((hoc xa) or (hoc ma)) hoi dan nhan tai*.