Perhaps you should try some spelling variations:
phan cong » thanh cong
sach doi » sach hoi, sach moi, sach dao
cong hoc » dong hoc, cong hoa, cong coc
su sach » so sach, vu sach
doi dap » hoi dap, doi dau, do dap
mon hoc » toan hoc, dong hoc
hoc mai » hoc ma, hoc dai, hoc may
mai hoi » mai khoi, dai hoi, lai hoi
va nhan » van nhan, ca nhan, va phan
nhan va » nhan tai, nhan dan, nhan tao
mo 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: su sach doi dap, nghien cuu ((mo hoc) OR (mon hoc)) phan cong hoc mai hoi va nhan va~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach doi dap, nghien cuu ((mo hoc) OR (mon hoc)) phan cong hoc mai hoi va nhan va*".