Perhaps you should try some spelling variations:
coc thuc » hoc thuc, doc thuc, co thuc
su sach » so sach, vu sach
ky dang » ky nang, ky danh
ky tang » ky nang, kho tang, ky trong
hieu ve » hieu va, hieu van
thuc va » thuc vat, thuc dan, thuc day
va tinh » may tinh
tinh va » tich va, trinh van, trinh vat
cua tre » cua te, cuu tre, cua triet
ve coc » ve cuoc, ve cac, ve co
va cua » va chua, via cua, ca cua

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 ((ky dang) or (ky tang)) xa hoi. hieu ve coc thuc va tinh va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((ky dang) OR (ky tang)) xa hoi. hieu ve coc thuc va tinh va cua tre.
• Adding a wildcard symbol may retrieve word variants: su sach ((ky dang) or (ky tang)) xa hoi. hieu ve coc thuc va tinh va cua tre*.