Perhaps you should try some spelling variations:
thanh vai » thanh hai, thanh van, thanh tai
toc sach » hoc sach, doc sach, thuoc sach
xa thanh » va thanh, ha thanh, ta thanh
vai cua » dai cua, hai cua, lai cua
xu lang » cu lang, xu dang, xu quang
tu lang » cu lang, tu lanh, tu quang
cua tre » cua te, cuu tre, cua triet

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) OR (vo co)) tuc xa thanh 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) OR (vo co)) tuc xa thanh vai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ((tu lang) or (xu lang)) xa hoi. hieu ((va co) OR (vo co)) tuc xa thanh vai cua tre".
• Adding a wildcard symbol may retrieve word variants: toc sach ((tu lang) or (xu lang)) xa hoi. hieu ((va co) OR (vo co)) tuc xa thanh vai cua tre*.