Perhaps you should try some spelling variations:
thai cuu » thai cua, tai cuc, thi cuc
su sach » so sach, vu sach
sach ly » sach y, sach lo, sach ty
van dau » van dao, phan dau
van cac » van hac, van cau, van bac
ly nang » ky nang, ly hang, ly vang
cuu tre » cua tre, cau tren, cau treo
va dan » va dao, va dau, va dap
ca dan » cac dan, ca dao
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ly nang x hoi. hieu ((van cac) or (van dau)) nuoc ((va dan) OR (ca dan)) thai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ly nang x hoi. hieu ((van cac) OR (van dau)) nuoc ((va dan) OR (ca dan)) thai cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ly nang x hoi. hieu ((van cac) or (van dau)) nuoc ((va dan) OR (ca dan)) thai cuu tre".
• Adding a wildcard symbol may retrieve word variants: su sach ly nang x hoi. hieu ((van cac) or (van dau)) nuoc ((va dan) OR (ca dan)) thai cuu tre*.