Perhaps you should try some spelling variations:
cau tren » dau tren, ca tren, cau treo
ban anh » ban hanh, ban banh, ban danh
xuc ban » duc ban, cuc ban, quoc ban
sach ky » sach y, sach ty, sach kem
hieu va » lieu va, hieu qua
cu tren » tu tren, dua tren
nang o » nang co, nang ho, nang ro
sac ky » cac ky, sai ky
anh di » danh di, xanh di, anh d
va cam » va cham, va cac, va cao
o hoc » co hoc, mo hoc, so hoc

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) or (sac ky)) nang o hoc. hieu va cam xuc ban anh di ((cau tren) OR (cu tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ky) OR (sac ky)) nang o hoc. hieu va cam xuc ban anh di ((cau tren) OR (cu tren)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ky) or (sac ky)) nang o hoc. hieu va cam xuc ban anh di ((cau tren) OR (cu tren))".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) or (sac ky)) nang o hoc. hieu va cam xuc ban anh di ((cau tren) OR (cu tren))*.