Perhaps you should try some spelling variations:
tinh hai » tinh thai, tinh chat, trinh han
su sach » so sach, vu sach
ty dang » ty xang, ty hang, ty dong
ky dang » ky nang, ky danh
hieu va » lieu va, hieu qua
va chat » van chat, va phat, cao chat
hai cuc » tai cuc, hai cua, thai cua
cuc tre » duc tre, cua tre, cuu tre
luc va » tuc va, loc 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 va chat ((luc va) OR (duc va)) tinh 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 va chat ((luc va) OR (duc va)) tinh 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 va chat ((luc va) OR (duc va)) tinh hai cuc tre".
• Adding a wildcard symbol may retrieve word variants: su sach ((ty dang) or (ky dang)) cau hoi. hieu va chat ((luc va) OR (duc va)) tinh hai cuc tre*.