Perhaps you should try some spelling variations:
su sach » so sach, vu sach
lang ha » long ha
hai cua » thai cua, dai cua, hoi cua
dan hai » doan hai, dang hai, dan khai
cao luc » bao luc, cao duc, cao suc
hieu va » lieu va, hieu qua
cua tre » cua te, cuu tre, cua triet
lang xa » dang xay, lang van
so sanh » do sanh
va cao » va cac, va co, va dao
luc va » duc va, tuc va, loc va
va dan » ca dan, va dao, va dau

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((su sach) or (so sanh)) ky ((lang xa) OR (lang ha)) hoi. hieu va cao luc va dan hai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (so sanh)) ky ((lang xa) OR (lang ha)) hoi. hieu va cao luc va dan hai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (so sanh)) ky ((lang xa) OR (lang ha)) hoi. hieu va cao luc va dan hai cua tre".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (so sanh)) ky ((lang xa) OR (lang ha)) hoi. hieu va cao luc va dan hai cua tre*.