Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
thanh vai » thanh hai, thanh van, thanh tai
cuu tre » cua tre, cau tren, cau treo
hieu va » lieu va, hieu qua
tu lanh » tu hanh, tu lenh, tu manh
tu lang » cu lang, xu lang, tu quang
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: thuoc sach ((tu lang) OR (tu lanh)) xa hoi. hieu va co tuc va ((thanh vai) or (doanh tai)) cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach ((tu lang) OR (tu lanh)) xa hoi. hieu va co tuc va ((thanh vai) OR (doanh tai)) cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc sach ((tu lang) OR (tu lanh)) xa hoi. hieu va co tuc va ((thanh vai) or (doanh tai)) cuu tre".
• Adding a wildcard symbol may retrieve word variants: thuoc sach ((tu lang) OR (tu lanh)) xa hoi. hieu va co tuc va ((thanh vai) or (doanh tai)) cuu tre*.