Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
nang ro » nang co, nang ho, nang ra
hieu ve » hieu va, hieu van
cuu tre » cau tren, cau treo
cua tre » cua te, cua triet, dua tren
y nang » ky nang, ly nang, v nang
ro hoi » co hoi, o hoi, mo hoi
ve cac » va cac, vien cac
cac tu » cac thu, cach tu, cac du

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 y nang ro hoi. hieu ve cac tu ((va dao) OR (ca dao)) voi ((cuu tre) or (cua tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach y nang ro hoi. hieu ve cac tu ((va dao) OR (ca dao)) voi ((cuu tre) OR (cua tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach y nang ro hoi. hieu ve cac tu ((va dao) OR (ca dao)) voi ((cuu tre) or (cua tre))".
• Adding a wildcard symbol may retrieve word variants: thu sach y nang ro hoi. hieu ve cac tu ((va dao) OR (ca dao)) voi ((cuu tre) or (cua tre))*.