Perhaps you should try some spelling variations:
cua thuoc » nha thuoc, cay thuoc, cua nuoc
toc sach » hoc sach, doc sach, thuoc sach
tan anh » tuan anh, tran anh, toan anh
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
cuu tre » cua tre, cau tren, cau treo
lang ha » long ha
du tan » duc tan, duy tan, du tap
anh ve » hanh ve, anh va, anh viet
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: toc sach ky ((lang ha) or (nang x)) hoi. hieu ve cac du tan anh ve ((cua thuoc) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ky ((lang ha) OR (nang x)) hoi. hieu ve cac du tan anh ve ((cua thuoc) OR (cuu tre)).
• Adding a wildcard symbol may retrieve word variants: toc sach ky ((lang ha) or (nang x)) hoi. hieu ve cac du tan anh ve ((cua thuoc) or (cuu tre))*.