Perhaps you should try some spelling variations:
doc sach » hoc sach, toc sach, nuoc sach
ly vang » ly hang, ly quang
hanh le » thanh le, hanh ve, hanh de
va hanh » van hanh, va thanh, va danh
ve cac » va cac, vien cac
le cua » ly cua
tuc va » thuc va, truc va, tuc xa
ve cam » ve cham, va cam, ve cai
ly van » le van, ly va, ly von
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: doc sach ((ly vang) OR (ly van)) xa hoi. hieu ((ve cam) or (ve cac)) tuc va hanh le cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc sach ((ly vang) OR (ly van)) xa hoi. hieu ((ve cam) OR (ve cac)) tuc va hanh le cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc sach ((ly vang) OR (ly van)) xa hoi. hieu ((ve cam) or (ve cac)) tuc va hanh le cua te".
• Adding a wildcard symbol may retrieve word variants: doc sach ((ly vang) OR (ly van)) xa hoi. hieu ((ve cam) or (ve cac)) tuc va hanh le cua te*.