Perhaps you should try some spelling variations:
hanh vai » hanh va, hanh tai, hanh van
su sach » so sach, vu sach
sach ty » sach y, sach tu, sach thu
cua tre » cuu tre, cua triet, dua tren
cuc ban » cua ban, cac ban, cuu ban
cac cuc » cac cuoc, cac cua, cac nuoc
hieu ve » hieu va, hieu van
ty hang » ly hang, ty xang, thi hang
ve cac » va cac, vien cac
va hoi » xa hoi, va hoc, va hoa
cua te » cua tu

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 va hoi. hieu ve cac cuc ban ((hanh vai) OR (hanh vi)) ((cua tre) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty hang va hoi. hieu ve cac cuc ban ((hanh vai) OR (hanh vi)) ((cua tre) OR (cua te)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ty hang va hoi. hieu ve cac cuc ban ((hanh vai) OR (hanh vi)) ((cua tre) or (cua te))".
• Adding a wildcard symbol may retrieve word variants: su sach ty hang va hoi. hieu ve cac cuc ban ((hanh vai) OR (hanh vi)) ((cua tre) or (cua te))*.