Perhaps you should try some spelling variations:
chat trung » chat trong, ha trung, cua trung
thuat sach » thuat lanh, thuat san
hieu cao » chieu cao, hieu cac, hieu ca
tu sach » thu sach, su sach, te sach
nang xa » nang x, lang xa, nang ma
cua tre » cua te, cuu tre, cua triet
va dan » va dao, va dau, va dap
ca dan » cac dan, ca dao

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

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