Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
phan chong » phan cong, phan hong, phap chong
sach hoi » sach doi, sach moi, cach thoi
hoc phan » hoc dan, hoc pho
hang tai » hang va, dung tai
va hang » van hang, va nang, va lang
mo hoc » mon hoc, co hoc

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 hoi dap, nghien cuu mo hoc phan chong ((hoc xa) or (hoc ma)) hoi va hang tai~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach hoi dap, nghien cuu mo hoc phan chong ((hoc xa) OR (hoc ma)) hoi va hang tai.
• Adding a wildcard symbol may retrieve word variants: thuat sach hoi dap, nghien cuu mo hoc phan chong ((hoc xa) or (hoc ma)) hoi va hang tai*.