Perhaps you should try some spelling variations:
hanh dai » hanh tai, hanh dao, vanh dai
tu sach » thu sach, su sach, te sach
dai cuu » dai cua, dai huu
va hanh » van hanh, va thanh, va danh
cam duc » cam xuc, cao duc, nam duoc
sach ky » sac ky, sach y, sach ty
hieu va » lieu va, hieu qua
lang ha » long ha
lang xa » dang xay, lang van
cuu tre » cua tre, cau tren, cau treo

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: tu sach ky ((lang xa) OR (lang ha)) hoi. hieu va ((cam duc) OR (pham duc)) va hanh dai cuu tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky ((lang xa) or (lang ha)) hoi. hieu va ((cam duc) OR (pham duc)) va hanh dai cuu tre~".
• Adding a wildcard symbol may retrieve word variants: tu sach ky ((lang xa) or (lang ha)) hoi. hieu va ((cam duc) OR (pham duc)) va hanh dai cuu tre*.