Perhaps you should try some spelling variations:
thien van » thi van
ban thanh » ban hanh, ban hang
xuc ban » duc ban, cuc ban, quoc ban
lam xuc » cam xuc, lam duoc
sach ky » sach y, sach ty, sach kem
van lam » van nam
nang o » nang co, nang ho, nang ro
sac ky » cac ky, sai ky
va cua » va chua, via cua, ma cua
ca cua » co cua
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: su ((sach ky) or (sac ky)) nang o hoc. thien van lam xuc ban thanh ((va cua) OR (ca cua)) te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ky) OR (sac ky)) nang o hoc. thien van lam xuc ban thanh ((va cua) OR (ca cua)) te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach ky) or (sac ky)) nang o hoc. thien van lam xuc ban thanh ((va cua) OR (ca cua)) te".
• Adding a wildcard symbol may retrieve word variants: su ((sach ky) or (sac ky)) nang o hoc. thien van lam xuc ban thanh ((va cua) OR (ca cua)) te*.