Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
thanh va » thanh van, hanh va, thanh ha
sach ky » sac ky, sach y, sach kem
sach ty » sach y, sach tu, sach thu
van bao » van ban, van dao
duc van » duc va, duc manh, duc phan
chu tre » cho tre, chu tri, cuu tre
va chu » va che, va cau, va chi
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: te ((sach ky) OR (sach ty)) nang x hoi. hieu van bao ((duc van) or (duc tan)) thanh va chu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach ky) OR (sach ty)) nang x hoi. hieu van bao ((duc van) OR (duc tan)) thanh va chu tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach ky) OR (sach ty)) nang x hoi. hieu van bao ((duc van) or (duc tan)) thanh va chu tre*".