Perhaps you should try some spelling variations:
hanh vai » hanh vi, hanh va, hanh tai
cac nuoc » cap nuoc, hoc nuoc, dat nuoc
vu sach » vu bach, vu khach
vai cua » dai cua, hai cua, lai cua
va hanh » van hanh, va thanh, va danh
cac luc » cau luc, coc luc, cac cuoc
cua tre » cua te, cuu tre, cua triet
hieu ve » hieu va, hieu van
nang xa » nang x, lang xa, nang ma
ly nang » ky nang, ly hang, ly vang
su sach » so sach

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((vu sach) or (su sach)) ly nang xa hoi. hieu ve ((cac luc) OR (cac nuoc)) va hanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu sach) OR (su sach)) ly nang xa hoi. hieu ve ((cac luc) OR (cac nuoc)) va hanh vai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((vu sach) or (su sach)) ly nang xa hoi. hieu ve ((cac luc) OR (cac nuoc)) va hanh vai cua tre".
• Adding a wildcard symbol may retrieve word variants: ((vu sach) or (su sach)) ly nang xa hoi. hieu ve ((cac luc) OR (cac nuoc)) va hanh vai cua tre*.