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