Perhaps you should try some spelling variations:
sach tru » sach truc, sach thu, sach tren
hieu van » hieu va, thien van, lieu va
hanh va » hang va, hanh vi
danh va » doanh va, anh va, dan va
bao duc » dao duc, bao luc, cao duc
van bao » van ban, van dao
sach tu » sach thu, cach tu, sach ty
cua te » cua tu
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: tu ((sach tru) or (sach tu)) nang x hoi. hieu van bao duc va ((danh va) OR (hanh va)) cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach tru) OR (sach tu)) nang x hoi. hieu van bao duc va ((danh va) OR (hanh va)) cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach tru) or (sach tu)) nang x hoi. hieu van bao duc va ((danh va) OR (hanh va)) cua te".
• Adding a wildcard symbol may retrieve word variants: tu ((sach tru) or (sach tu)) nang x hoi. hieu van bao duc va ((danh va) OR (hanh va)) cua te*.