Perhaps you should try some spelling variations:
nhanh thi » nhanh thai, nhanh thuc, nhanh ha
nhan tai » hang tai, van tai, toan tai
su sach » so sach, vu sach
duc van » duc va, duc tan, duc manh
xuc ban » duc ban, cuc ban, quoc ban
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet
ve cac » va cac, vien cac
nang o » nang co, nang ho, nang ro
o hoi » co hoi, o hoc, o hai

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 nang o hoi. hieu ve cac ((xuc ban) or (duc van)) ((nhanh thi) or (nhan tai)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang o hoi. hieu ve cac ((xuc ban) OR (duc van)) ((nhanh thi) OR (nhan tai)) cua tre.
• Adding a wildcard symbol may retrieve word variants: su sach ky nang o hoi. hieu ve cac ((xuc ban) or (duc van)) ((nhanh thi) or (nhan tai)) cua tre*.