Perhaps you should try some spelling variations:
luan phan » luan van, luan hoan
phan lap » phan dau
xuc luan » luc luan, xu luan, nuoc luan
tu sach » thu sach, su sach, te sach
ve cham » va cham, ve chat, vu cham
lap cua » lai cua, tap cua, lam cua
cua tre » cua te, cuu tre, cua triet
sach ky » sac ky, sach y, sach ty
ve cam » ve cac, va cam, ve cai
co hoi » co hoc, co loi
o hoi » o hoc, o hai, 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 (co hoi)). hieu ((ve cam) or (ve cham)) xuc luan phan lap cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang ((o hoi) OR (co hoi)). hieu ((ve cam) OR (ve cham)) xuc luan phan lap cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang ((o hoi) or (co hoi)). hieu ((ve cam) or (ve cham)) xuc luan phan lap cua tre*.