Perhaps you should try some spelling variations:
chat thuc » thuat thuc, nhan thuc, chat thai
thu sach » tu sach, thuat sach, thuoc sach
hieu cao » chieu cao, hieu cac, hieu ca
ky lang » ky nang, ky tang, tay lang
ky dang » ky nang, ky danh
va danh » va dinh, va hanh, dia danh
cua tre » cua te, cuu tre, cua triet
va dan » ca dan, va dao, va dau

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ((ky lang) OR (ky dang)) xa hoi. hieu cao chat thuc ((va danh) or (va dan)) dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ((ky lang) OR (ky dang)) xa hoi. hieu cao chat thuc ((va danh) OR (va dan)) dai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ((ky lang) OR (ky dang)) xa hoi. hieu cao chat thuc ((va danh) or (va dan)) dai cua tre".
• Adding a wildcard symbol may retrieve word variants: thu sach ((ky lang) OR (ky dang)) xa hoi. hieu cao chat thuc ((va danh) or (va dan)) dai cua tre*.