Perhaps you should try some spelling variations:
phap phuong » phap phong, phap chong, pho phuong
phuong tien » phuong trinh
dang phuong » bang phuong, dung phuong, dan phuong
gian dang » gian dan, gian lang, gian dong
sach cba » sach cua, sach nha, sach bai
te sach » toc sach
me giai » de giai, ve giai, ke giai
sach ba » sach bai, sach bac, sach bao
me gian » ma giang
cba me » cha me, ca me

You may be able to get more results by adjusting your search query.

• If you are trying to use Boolean operators, they must be ALL CAPS: (( te sach cba me giai phap phuong tien ) OR ( te sach ba me gian dang phuong tien ))~.
• Adding a wildcard symbol may retrieve word variants: (( te sach cba me giai phap phuong tien ) or ( te sach ba me gian dang phuong tien ))*.