Perhaps you should try some spelling variations:
thanh vai » thanh hai, thanh van, thanh tai
ban thanh » ban hanh, ban hang
thu sach » tu sach, thuat sach, thuoc sach
hoc sach » hoc sinh, hoc cac, hoc anh
dua ban » dia ban, cua ban, qua ban
cua tre » cua te, cua triet, dua tren
cam dua » ca dua, cay dua, chay dua
hieu va » lieu va, hieu qua
lang xa » lang ha, dang xay, lang van
cuu tre » cau tren, cau treo
va cam » va cham, va cac, va cao
y lang » o lang, _ lang, tay lang

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((thu sach) or (hoc sach)) y lang xa hoi. hieu va cam dua ban thanh vai ((cua tre) OR (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (hoc sach)) y lang xa hoi. hieu va cam dua ban thanh vai ((cua tre) OR (cuu tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu sach) or (hoc sach)) y lang xa hoi. hieu va cam dua ban thanh vai ((cua tre) OR (cuu tre))".
• Adding a wildcard symbol may retrieve word variants: ((thu sach) or (hoc sach)) y lang xa hoi. hieu va cam dua ban thanh vai ((cua tre) OR (cuu tre))*.