Perhaps you should try some spelling variations:
hanh tai » thanh tai, hang tai, han tai
su sach » so sach, vu sach
cua tre » cua te, cua triet, dua tren
va hanh » van hanh, va thanh, va danh
cac tuc » cac toc, cac tu, cac tac
hieu ve » hieu va, hieu van
ty hang » ly hang, ty xang, thi hang
cuu tre » cau tren, cau treo
ve cac » va cac, vien cac
y hang » ly hang, yu hang, _ hang
tuc va » thuc va, truc va, tuc xa

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: su sach ((y hang) OR (ty hang)) xa hoi. hieu ve cac tuc va hanh tai ((cua tre) OR (cuu tre))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((y hang) OR (ty hang)) xa hoi. hieu ve cac tuc va hanh tai ((cua tre) or (cuu tre))~".
• Adding a wildcard symbol may retrieve word variants: su sach ((y hang) OR (ty hang)) xa hoi. hieu ve cac tuc va hanh tai ((cua tre) or (cuu tre))*.