Perhaps you should try some spelling variations:
phuong tien » phuong trinh
co phuong » so phuong, co huong, co phong
hong hinh » hong hanh, thong minh, hang chinh
gioi hon » gio hon, gioi bon, gioi han
su sach » so sach
sach ba » sach bai, sach bac, sach bao
me giai » de giai, ve giai, ke giai
giai co » giai cao, gian co, gioi co
vu sach » vu bach, vu khach
gio hoc » gio hoac, gio hon, giup hoc
nha me » cha me, nha mo, nha xe

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 ba me giai co phuong tien ) or ( vu sach nha me ((gio hoc) or (gioi hon)) hong hinh ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( su sach ba me giai co phuong tien ) OR ( vu sach nha me ((gio hoc) OR (gioi hon)) hong hinh )).
• Adding a wildcard symbol may retrieve word variants: (( su sach ba me giai co phuong tien ) or ( vu sach nha me ((gio hoc) or (gioi hon)) hong hinh ))*.