Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
thu bang » thu hang, chu bang, thu trang
hanh le » thanh le, hanh ve, hanh de
va tham » van tham, va cham, va thanh
hieu va » lieu va, hieu qua
thu ban » thu hang
soc va » hoc va, loc va, goc va
doc va » duoc va, hoc va, duc va
le cua » ly cua
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach ((thu bang) OR (thu ban)) xa hoi. hieu va tham ((soc va) or (doc va)) hanh le cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ((thu bang) OR (thu ban)) xa hoi. hieu va tham ((soc va) OR (doc va)) hanh le cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ((thu bang) OR (thu ban)) xa hoi. hieu va tham ((soc va) or (doc va)) hanh le cua te".
• Adding a wildcard symbol may retrieve word variants: toc sach ((thu bang) OR (thu ban)) xa hoi. hieu va tham ((soc va) or (doc va)) hanh le cua te*.