Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
hanh doi » thanh doi, hanh noi, hang doi
su sach » so sach, vu sach
ty nang » ty xang, ty hang, ly nang
tuc van » thuc van, truc van, tuc va
doi cua » dai cua, hoi cua
cua tre » cua te, cuu tre, cua triet
va dao » ca dao

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ((ty nang) or (ky nang)) xa hoi. lieu ((va dau) OR (va dao)) tuc van hanh doi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((ty nang) OR (ky nang)) xa hoi. lieu ((va dau) OR (va dao)) tuc van hanh doi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((ty nang) or (ky nang)) xa hoi. lieu ((va dau) OR (va dao)) tuc van hanh doi cua tre".
• Adding a wildcard symbol may retrieve word variants: su sach ((ty nang) or (ky nang)) xa hoi. lieu ((va dau) OR (va dao)) tuc van hanh doi cua tre*.