Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
tinh vai » tinh va, tinh hai, tinh bai
tu lang » cu lang, tu lanh, tu quang
xu lang » cu lang, xu dang, xu quang
hieu va » lieu va, hieu qua
va tinh » may tinh
vai cua » dai cua, hai cua, lai cua
cua tre » cua te, cuu tre, cua triet
co tuc » co thuc, co tu, co toc
tuc va » thuc va, truc va, tuc xa
va co » vo co

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach ((tu lang) or (xu lang)) xa hoi. hieu va co tuc va tinh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ((tu lang) OR (xu lang)) xa hoi. hieu va co tuc va tinh vai cua tre.
• Adding a wildcard symbol may retrieve word variants: toc sach ((tu lang) or (xu lang)) xa hoi. hieu va co tuc va tinh vai cua tre*.