Perhaps you should try some spelling variations:
nang dai » nang dau, nang tai, lang dai
va thanh » gia thanh, ban thanh, va tinh
van hanh » van thanh, ban hanh, van anh
hanh doi » thanh doi, hanh noi, hang doi
te sach » toc sach
dai hoi » dai hoc, dai hai, dai moi
va tham » van tham, va cham, va thuat
duc van » duc va, duc tan, duc manh
doi cua » dai cua, hoi cua
cua tre » cua te, cuu tre, cua triet
y nang » ky nang, ly nang, v nang

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 dai hoi. hieu ((va tham) or (va thanh)) duc van hanh doi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach y nang dai hoi. hieu ((va tham) OR (va thanh)) duc van hanh doi cua tre.
• Adding a wildcard symbol may retrieve word variants: te sach y nang dai hoi. hieu ((va tham) or (va thanh)) duc van hanh doi cua tre*.