Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
te sach » toc sach
cua tre » cua te, cua triet, dua tren
duc van » duc va, duc tan, duc manh
cuu tre » cau tren, cau treo
y nang » ky nang, ly nang, v nang
ve cau » ke cau, va cau, le cau
ve cac » va cac, vien cac
x hoi » xa hoi, o hoi, x ho

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 x hoi. hieu ((ve cau) OR (ve cac)) duc van hanh kem ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach y nang x hoi. hieu ((ve cau) OR (ve cac)) duc van hanh kem ((cua tre) OR (cuu tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach y nang x hoi. hieu ((ve cau) OR (ve cac)) duc van hanh kem ((cua tre) or (cuu tre))".
• Adding a wildcard symbol may retrieve word variants: te sach y nang x hoi. hieu ((ve cau) OR (ve cac)) duc van hanh kem ((cua tre) or (cuu tre))*.