Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
nghien thu » nghiem thuc, nghiep thuc, nghien cuu
thu sach » tu sach, thuat sach, thu hoach
cong hoc » dong hoc, cong hoa, cong coc
hoc hanh » hoc nhanh, hoc thanh, hoc anh
hanh hoa » thanh hoa, khanh hoa, hang hoa
dan phan » doan phan, dan chan, van phan
phan dan » phan dang, phan dau, nhan dan
hoi tap » hoi dap, hoc tap, hoi 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: ((thu sach) OR (thuoc sach)) hoi tap, nghien thu cong hoc hanh hoa hoc xa hoi dan phan dan~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu sach) OR (thuoc sach)) hoi tap, nghien thu cong hoc hanh hoa hoc xa hoi dan phan dan".
• Adding a wildcard symbol may retrieve word variants: ((thu sach) OR (thuoc sach)) hoi tap, nghien thu cong hoc hanh hoa hoc xa hoi dan phan dan*.