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