Perhaps you should try some spelling variations:
ttong tien » trong tien, tuong tien, trong tieng
tong tien » trong tien, dong tien, trong tieng
hoc ttong » hoc trong, hoc thong, hoc tong
sach phan » sach han, mach phan, sach phat
phe thai » pho thai, he than, khi thai
thai hoc » dai hoc, bai hoc, hoi hoc
sach cha » sach nha, sach che, sach ha
ve gioi » vien gioi, van gioi
co tong » co trong, co dong, co ton
ve giai » va giai, ve giao, de giai
tu sach » thu sach, te sach, tu cach
cha phe » ca phe, chau phi, chau phu
su sach » so sach, vu sach

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

• Performing a fuzzy search may retrieve terms with similar spellings: (( tu sach cha phe thai hoc ttong tien ) or ( su sach phan ((ve gioi) or (ve giai)) co tong tien ))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: (( tu sach cha phe thai hoc ttong tien ) OR ( su sach phan ((ve gioi) OR (ve giai)) co tong tien )).
• Adding a wildcard symbol may retrieve word variants: (( tu sach cha phe thai hoc ttong tien ) or ( su sach phan ((ve gioi) or (ve giai)) co tong tien ))*.