Perhaps you should try some spelling variations:
hang vai » hang tai, hang hai, hang vi
tu sach » thu sach, su sach, te sach
hieu ve » hieu va, hieu van
cua tre » cuu tre, cua triet, dua tren
y nang » ky nang, ly nang, v nang
nang o » nang co, nang ho, nang ro
ve cac » va cac, vien cac
du ban » dua ban, duc ban, du bao
cua te » cua tu
o hai » co hai, so hai, o lai

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 y nang o hai. hieu ve cac du ban ((hang vai) or (hang va)) ((cua tre) OR (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang o hai. hieu ve cac du ban ((hang vai) OR (hang va)) ((cua tre) OR (cua te)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y nang o hai. hieu ve cac du ban ((hang vai) or (hang va)) ((cua tre) OR (cua te))".
• Adding a wildcard symbol may retrieve word variants: tu sach y nang o hai. hieu ve cac du ban ((hang vai) or (hang va)) ((cua tre) OR (cua te))*.