Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
ca chua » sua chua
va tinh » may tinh
sach ty » sach y, sach tu, sach thu
hieu va » lieu va, hieu qua
va chao » va cao, va chat, va cham
ty nang » ky nang, ty xang, ty hang
ma hoi » mai hoi, ma hoa, me hoi
ca cua » co cua
xu va » xu van, tu va, su va

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ty nang ((ma hoi) or (xa hoi)). hieu va chao xu va tinh ((ca chua) or (ca cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ty nang ((ma hoi) OR (xa hoi)). hieu va chao xu va tinh ((ca chua) OR (ca cua)) tre.
• Adding a wildcard symbol may retrieve word variants: thu sach ty nang ((ma hoi) or (xa hoi)). hieu va chao xu va tinh ((ca chua) or (ca cua)) tre*.