Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
hanh giau » thanh gian, danh gia, anh giao
giau cua » gian cua, gia cua, dieu cua
van hanh » van thanh, ban hanh, van anh
van hau » van ha, van hai, van hac
duc van » duc va, duc tan, duc manh
van dau » van dao, phan dau
cua tre » cua te, cuu tre, cua triet
sach ky » sac ky, sach y, sach ty
o hoi » co hoi, o hoc, o hai
x hoi » xa hoi, x ho, 5 hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuat sach ky nang ((x hoi) or (o hoi)). hieu ((van dau) or (van hau)) duc van hanh giau cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach ky nang ((x hoi) OR (o hoi)). hieu ((van dau) OR (van hau)) duc van hanh giau cua tre.
• Adding a wildcard symbol may retrieve word variants: thuat sach ky nang ((x hoi) or (o hoi)). hieu ((van dau) or (van hau)) duc van hanh giau cua tre*.