Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
so sach » so sanh, bo sach, co sach
lang xa » lang ha, dang xay, lang van
hieu ve » hieu va
va lanh » va lang, va danh, va hanh
dao hoa » dao hoan, do hoa, bao hoa
y lang » o lang, _ lang, tay lang
nam tu » nam thu, nam thuc
dao ho » dao o, dao do

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

• If you are trying to use Boolean operators, they must be ALL CAPS: so sach y lang xa hoi. ((hieu ve) OR (hieu van)) nam tu va lanh ((dao hoa) OR (dao ho)) viet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach y lang xa hoi. ((hieu ve) or (hieu van)) nam tu va lanh ((dao hoa) OR (dao ho)) viet~".
• Adding a wildcard symbol may retrieve word variants: so sach y lang xa hoi. ((hieu ve) or (hieu van)) nam tu va lanh ((dao hoa) OR (dao ho)) viet*.