Perhaps you should try some spelling variations:
thien van » thi van
ban thanh » ban hanh, ban hang
nam duoc » nam thuoc, da duoc, dat duoc
sach ky » sac ky, sach ty, sach kem
nang xa » nang x, lang xa, nang ma
cao duc » dao duc, cao suc, giao duc
san cua » sang cua, ban cua, dan cua
cua tre » cua te, cuu tre, cua triet

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 (sach y)) nang xa hoi. thien van ((nam duoc) or (cao duc)) ban thanh san cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ky) OR (sach y)) nang xa hoi. thien van ((nam duoc) OR (cao duc)) ban thanh san cua tre.
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) or (sach y)) nang xa hoi. thien van ((nam duoc) or (cao duc)) ban thanh san cua tre*.