Perhaps you should try some spelling variations:
hanh vai » hanh vi, hanh va, hanh tai
vai cua » dai cua, hai cua, lai cua
va hanh » van hanh, va thanh, va danh
cac lop » cac hop, cac loai
cua tre » cua te, cuu tre, cua triet
hieu va » lieu va, hieu qua
nang xa » nang x, lang xa, nang ma
xac ky » cac ky, bac ky
sac ky » cac ky, sai ky
cac lo » cac co, cac bo, cac ho

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

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