Perhaps you should try some spelling variations:
thien van » thi van
van phan » van phong, van thanh, luan phan
phan duc » pham duc, phan tu, phan dau
ban hang » ngan hang
vai cua » dai cua, hai cua, lai cua
cua tre » cua te, cuu tre, cua triet
nang xa » nang x, lang xa, nang ma
bai ky » ban ky, bac ky, dai ky
sai ky » sac ky

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((bai ky) or (sai ky)) nang xa hoi. thien van phan duc ((ban hanh) OR (ban hang)) vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((bai ky) OR (sai ky)) nang xa hoi. thien van phan duc ((ban hanh) OR (ban hang)) vai cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((bai ky) or (sai ky)) nang xa hoi. thien van phan duc ((ban hanh) OR (ban hang)) vai cua tre*".