Perhaps you should try some spelling variations:
thanh vai » thanh hai, thanh van, thanh tai
va thanh » gia thanh, ban thanh, va tinh
su sach » so sach, vu sach
cua tre » cua te, cua triet, dua tren
cac loc » cac lop, cac toc, cac hoc
sach ky » sac ky, sach y, sach ty
cuu tre » cau tren, cau treo
hieu ve » hieu va, hieu van
lang ha » long ha
lang xa » dang xay, lang van
loc va » hoc va, luc va
ve cac » va cac, vien cac

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 ky ((lang xa) OR (lang ha)) hoi. hieu ve cac loc va thanh vai ((cua tre) OR (cuu tre))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky ((lang xa) or (lang ha)) hoi. hieu ve cac loc va thanh vai ((cua tre) OR (cuu tre))~".
• Adding a wildcard symbol may retrieve word variants: su sach ky ((lang xa) or (lang ha)) hoi. hieu ve cac loc va thanh vai ((cua tre) OR (cuu tre))*.