Perhaps you should try some spelling variations:
phuong tin » phuong tien, thuong tin, phuong trinh
sach che » sach thue, sach nha, sach cap
gioi con » gioi co, gioi bon, gioi can
con hong » con song, cong thong, cong khong
hong tin » thong tin, hong tien, dong tin
so sach » so sanh, bo sach, co sach
de giai » dan giai
tu sach » thu sach, su sach, te sach
sach ba » sach bai, sach bac, sach bao
me gioi » me giai, ve gioi, me nguoi
doan » doanh, dan, toan

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( so sach che ((de giai) or (kem giai)) doan phuong tin ) or ( tu sach ba me gioi con hong tin ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( so sach che ((de giai) OR (kem giai)) doan phuong tin ) OR ( tu sach ba me gioi con hong tin )).
• Adding a wildcard symbol may retrieve word variants: (( so sach che ((de giai) or (kem giai)) doan phuong tin ) or ( tu sach ba me gioi con hong tin ))*.