Perhaps you should try some spelling variations:
va thanh » gia thanh, ban thanh, va tinh
hanh tai » thanh tai, hang tai, han tai
van hanh » van thanh, ban hanh, van anh
nuoc van » nuoc va, nuoc san, luoc van
te sach » toc sach
tai cuu » tai cuc, tai buu, tai cua
va tham » van tham, va cham, va thuat
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
cuu tre » cua tre, cau tren, cau treo
co hoi » co hoc, co loi

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 ty nang ((co hoi) or (cau hoi)). hieu ((va tham) or (va thanh)) nuoc van hanh tai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ty nang ((co hoi) OR (cau hoi)). hieu ((va tham) OR (va thanh)) nuoc van hanh tai cuu tre.
• Adding a wildcard symbol may retrieve word variants: te sach ty nang ((co hoi) or (cau hoi)). hieu ((va tham) or (va thanh)) nuoc van hanh tai cuu tre*.