Perhaps you should try some spelling variations:
ban banh » ban hanh, ban anh, ban danh
cau tren » cu tren, ca tren, cau treo
dau tren » dau tien, dat tren, dau tieng
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
hieu va » hieu qua
xuc ban » duc ban, cuc ban, quoc ban
banh di » danh di, xanh di, banh chi
nang o » nang co, nang ho, nang ro
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 ky nang o hai. ((hieu va) OR (lieu va)) cam xuc ban banh di ((cau tren) or (dau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang o hai. ((hieu va) OR (lieu va)) cam xuc ban banh di ((cau tren) OR (dau tren)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang o hai. ((hieu va) OR (lieu va)) cam xuc ban banh di ((cau tren) or (dau tren))".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang o hai. ((hieu va) OR (lieu va)) cam xuc ban banh di ((cau tren) or (dau tren))*.