Perhaps you should try some spelling variations:
thien van » thi van
ban hanh » ban hang
sach ky » sac ky, sach y, sach kem
hanh va » hang va, hanh vi
duc ban » duc tan, duc van, dua ban
cau duc » cao duc, cau luc, chu duc
van cau » van dau, van hau, van chat
sach ty » sach y, sach tu, sach thu
va cua » va chua, via cua, ca cua
cua te » cua tu
x hoi » o hoi, x ho, 5 hoi

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) OR (xa hoi)). thien van cau duc ban hanh va cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach ky) OR (sach ty)) nang ((x hoi) OR (xa hoi)). thien van cau duc ban hanh va cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach ky) or (sach ty)) nang ((x hoi) OR (xa hoi)). thien van cau duc ban hanh va cua te".
• Adding a wildcard symbol may retrieve word variants: te ((sach ky) or (sach ty)) nang ((x hoi) OR (xa hoi)). thien van cau duc ban hanh va cua te*.