Perhaps you should try some spelling variations:
hanh di » hanh vi, hanh de, hang di
va hanh » van hanh, va thanh, va danh
sach ky » sac ky, sach ty, sach kem
ke cau » ket cau
di cua » dai cua, doi cua, de cua
luc va » duc va, tuc va, loc va
ve cau » va cau, ve cac, le cau
nang o » nang co, nang ho, nang ro
cua te » cua tu
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) OR (sach y)) nang o hoi. hieu ((ve cau) or (ke cau)) luc va hanh di cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach ky) OR (sach y)) nang o hoi. hieu ((ve cau) OR (ke cau)) luc va hanh di cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach ky) OR (sach y)) nang o hoi. hieu ((ve cau) or (ke cau)) luc va hanh di cua te".
• Adding a wildcard symbol may retrieve word variants: te ((sach ky) OR (sach y)) nang o hoi. hieu ((ve cau) or (ke cau)) luc va hanh di cua te*.