Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
va thanh » gia thanh, ban thanh, va tinh
hanh lai » hanh lam, hanh tai, thanh lap
van hanh » van thanh, ban hanh, van anh
nuoc van » nuoc va, nuoc san, luoc van
lai cuu » lai cua, lai chau, lai cuoc
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: toc sach ty nang ((co hoi) or (cau hoi)). hieu ((va tham) or (va thanh)) nuoc van hanh lai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ty nang ((co hoi) OR (cau hoi)). hieu ((va tham) OR (va thanh)) nuoc van hanh lai cuu tre.
• Adding a wildcard symbol may retrieve word variants: toc sach ty nang ((co hoi) or (cau hoi)). hieu ((va tham) or (va thanh)) nuoc van hanh lai cuu tre*.