Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
tang van » dang van, hoang van, trong van
cua tre » cua te, cuu tre, cua triet
hanh de » hanh ve, hanh kem
duc van » duc va, duc tan, duc manh
ve cham » va cham, ve chat, vu cham
ky tang » ky nang, ky dang, kho tang
va cam » va cham, va cac, va cao
va dai » va dao, vi dai, va dau
de cua » le cua, te cua, dieu cua
vu dai » vi dai, vu hai, su dai

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((vu dai) or (va dai)) ky tang van hoa. hieu ((ve cham) or (va cam)) duc van hanh de cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu dai) OR (va dai)) ky tang van hoa. hieu ((ve cham) OR (va cam)) duc van hanh de cua tre.
• Adding a wildcard symbol may retrieve word variants: ((vu dai) or (va dai)) ky tang van hoa. hieu ((ve cham) or (va cam)) duc van hanh de cua tre*.