Perhaps you should try some spelling variations:
thai cua » than cua, tai cuc, tri cua
anh thai » anh thi, anh tai, nhanh thai
sach ky » sac ky, sach y, sach ty
van anh » van thanh, tuan anh, van minh
duc van » duc va, duc tan, duc manh
cac duc » cac du, cao duc, cac dac
hieu ve » hieu va, hieu van
tu sach » thu sach, su sach, te sach
cua tre » cua te, cuu tre, cua triet
co hoi » co hoc, co loi
ve cac » va cac, vien cac
o hai » co hai, so hai, o lai
o hoi » o hoc, o hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ky nang ((o hoi) or (((o hai) or (co hoi)))). hieu ve cac duc van anh thai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang ((o hoi) OR (((o hai) OR (co hoi)))). hieu ve cac duc van anh thai cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang ((o hoi) or (((o hai) or (co hoi)))). hieu ve cac duc van anh thai cua tre*.