Perhaps you should try some spelling variations:
co sach » bo sach, cuon sach, hoc sach
duc tre » duoc tren, duc tien
han tai » hang tai, nhan tai, van tai
cac tuc » cac toc, cac tu, cac tac
sach ly » sach y, sach lo, sach ty
cuu tre » cua tre, cau tren, cau treo
hang xa » hoang xa, hang ca, lang xa
hieu ve » hieu va, hieu van
tuc va » thuc va, truc va, tuc xa
va han » va phan, van han, va hanh
ve cac » va cac, vien cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: co sach ly ((hang xa) or (hang va)) hoi. hieu ve cac tuc va han tai ((duc tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: co sach ly ((hang xa) OR (hang va)) hoi. hieu ve cac tuc va han tai ((duc tre) OR (cuu tre)).
• Adding a wildcard symbol may retrieve word variants: co sach ly ((hang xa) or (hang va)) hoi. hieu ve cac tuc va han tai ((duc tre) or (cuu tre))*.