Perhaps you should try some spelling variations:
hanh dien » nhanh dien, hang dien, danh dien
dien cua » dieu cua, dien cuc, dien cu
te sach » toc sach
sach ky » sac ky, sach y, sach ty
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
nang o » nang co, nang ho, nang ro
ve cau » ke cau, ve cac, le cau
va cau » van cau, va cac, va dau
luc va » duc va, tuc va, loc va
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: te sach ky nang o hoi. hieu ((ve cau) OR (va cau)) luc va hanh dien cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky nang o hoi. hieu ((ve cau) OR (va cau)) luc va hanh dien cua tre".
• Adding a wildcard symbol may retrieve word variants: te sach ky nang o hoi. hieu ((ve cau) OR (va cau)) luc va hanh dien cua tre*.