Perhaps you should try some spelling variations:
thanh hai » thanh phan, thanh hoa, thanh san
hai cuc » tai cuc, hai cua, thai cua
su sach » so sach, vu sach
ve chat » va chat, van chat
hieu ve » hieu va, hieu van
ky dang » ky nang, ky danh
ty dang » ty xang, ty hang, ty dong
cuc tre » duc tre, cua tre, cuu tre
luc va » duc va, tuc va
loc va » hoc va

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 ((ty dang) or (ky dang)) cau hoi. hieu ve chat ((luc va) OR (loc va)) thanh hai cuc tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((ty dang) OR (ky dang)) cau hoi. hieu ve chat ((luc va) OR (loc va)) thanh hai cuc tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((ty dang) or (ky dang)) cau hoi. hieu ve chat ((luc va) OR (loc va)) thanh hai cuc tre".
• Adding a wildcard symbol may retrieve word variants: su sach ((ty dang) or (ky dang)) cau hoi. hieu ve chat ((luc va) OR (loc va)) thanh hai cuc tre*.