Perhaps you should try some spelling variations:
thanh toan » thanh hoa, thanh san, tinh toan
thanh van » thanh san, thanh phan, thanh nhan
su sach » so sach, vu sach
cuu tre » cua tre, cau tren, cau treo
sach ty » sach y, sach tu, sach thu
cao suc » cao su, cao duc
hieu va » lieu va, hieu qua
hang xa » hoang xa, hang va, hang ca
ty hang » ly hang, ty xang, thi hang

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 ty hang xa hoi. hieu va ((cao suc) or (giao duc)) ban ((thanh van) OR (thanh toan)) cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty hang xa hoi. hieu va ((cao suc) OR (giao duc)) ban ((thanh van) OR (thanh toan)) cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ty hang xa hoi. hieu va ((cao suc) or (giao duc)) ban ((thanh van) OR (thanh toan)) cuu tre".
• Adding a wildcard symbol may retrieve word variants: su sach ty hang xa hoi. hieu va ((cao suc) or (giao duc)) ban ((thanh van) OR (thanh toan)) cuu tre*.