Perhaps you should try some spelling variations:
thanh vai » thanh hai, thanh van, thanh tai
sach tu » sach thu, cach tu, sach uu
cuu tre » cua tre, cau tren, cau treo
hieu va » lieu va, hieu qua
lang xa » lang ha, dang xay, lang van
sach ty » sach y, sach thu, xach tay
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) OR (sach ty)) lang 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) OR (sach ty)) lang 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) OR (sach ty)) lang xa hoi. hieu va co tuc va ((thanh vai) or (doanh tai)) cuu tre*".