Perhaps you should try some spelling variations:
su sach » so sach, vu sach
ky sang » ky dang, ky tang, duy sang
hai cua » thai cua, dai cua, hoi cua
tao hoi » tao khoi, tao boi, tay hoi
hieu ve » hieu van
dan hai » doan hai, dang hai, dan khai
hieu va » lieu va, hieu qua
cac tuc » cac toc, cac tu, cac tac
va dan » ca dan, va dao, va dau
cua te » cua tu
tuc va » thuc va, truc va, tuc xa

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: su sach ((ky sang) OR (ky nang)) tao hoi. ((hieu ve) OR (hieu va)) cac tuc va dan hai cua te~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((ky sang) OR (ky nang)) tao hoi. ((hieu ve) or (hieu va)) cac tuc va dan hai cua te~".
• Adding a wildcard symbol may retrieve word variants: su sach ((ky sang) OR (ky nang)) tao hoi. ((hieu ve) or (hieu va)) cac tuc va dan hai cua te*.