Perhaps you should try some spelling variations:
toc sach » hoc sach, thuoc sach, nuoc sach
doc sach » hoc sach, nuoc sach, dac sac
lang ha » long ha
va hanh » van hanh, va thanh, va danh
v lang » va lang, o lang, _ lang
ha hoi » hoa hoi, ha noi, xa hoi
va cam » va cham, va cao, va cai
vi cua » vai cua, di 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) OR (doc sach)) v lang ha hoi. hieu ((va cam) or (va cac)) duc va hanh vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sach) OR (doc sach)) v lang ha hoi. hieu ((va cam) OR (va cac)) duc va hanh vi cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((toc sach) OR (doc sach)) v lang ha hoi. hieu ((va cam) or (va cac)) duc va hanh vi cua te".
• Adding a wildcard symbol may retrieve word variants: ((toc sach) OR (doc sach)) v lang ha hoi. hieu ((va cam) or (va cac)) duc va hanh vi cua te*.