Perhaps you should try some spelling variations:
nghien thu » nghiem thuc, nghiep thuc, nghien cuu
hoc nhanh » hoc nganh, hoc phan
nhanh hoa » nhanh hoan, thanh hoa, khanh hoa
cong hoc » dong hoc, cong hoa, cong coc
dan nhan » danh nhan, dan chan, van nhan
nhan tai » hang tai, van tai, toan tai
tu sach » thu sach, su sach, tu cach
te sach » toc sach
doi tap » doi tac, doi dap, doi tai
hoi dan » hoa dan, hoc dan, hoi dap
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 (te sach)) doi tap, nghien thu cong hoc nhanh hoa hoc xa hoi dan nhan tai~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (te sach)) doi tap, nghien thu cong hoc nhanh hoa hoc xa hoi dan nhan tai".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (te sach)) doi tap, nghien thu cong hoc nhanh hoa hoc xa hoi dan nhan tai*.