Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
luoc van » luoc can, luoc va, luc van
cau luoc » cau luc, muu luoc, hau loc
lai hoi » dai hoi, lai hoa, lai roi
hanh de » hanh ve, hanh kem
hieu ve » hieu va, hieu van
te sach » toc sach
mai hoi » mai khoi, dai hoi, mai doi
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang
ve cau » ke cau, va cau, ve cac
ma hoi » xa hoi, ma hoa, me hoi
de cua » le cua, te cua, dieu cua

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 y nang ((ma hoi) or (((mai hoi) OR (lai hoi)))). hieu ve cau luoc van hanh de cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach y nang ((ma hoi) OR (((mai hoi) OR (lai hoi)))). hieu ve cau luoc van hanh de cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach y nang ((ma hoi) or (((mai hoi) OR (lai hoi)))). hieu ve cau luoc van hanh de cua tre*".