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

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)). hieu ((ve cau) OR (ke cau)) luc 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)). hieu ((ve cau) OR (ke cau)) luc 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)). hieu ((ve cau) OR (ke cau)) luc van hanh de cua tre*".