Perhaps you should try some spelling variations:
phuong tien » phuong trinh
lang phuong » bang phuong, lan phuong, lang phong
han phuong » van phuong, dan phuong, han thuong
giai lang » gian lang, gia tang, gian lan
giai han » giai san, giai phap, giai phau
sach cha » sach che, sach ha, sach cua
te sach » toc sach
ve giai » va giai, ve giao, de giai
me giai » de giai, ke giai, le giai
nha ve » nhat ve, nhan ve, nha va

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 nha ve giai han phuong tien ) OR ( te sach cha me giai lang phuong tien ))~.
• Adding a wildcard symbol may retrieve word variants: (( te sach nha ve giai han phuong tien ) or ( te sach cha me giai lang phuong tien ))*.