Perhaps you should try some spelling variations:
hanh vai » hanh vi, hanh va, hanh tai
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
vai cua » dai cua, hai cua, lai cua
cua tre » cua te, cuu tre, cua triet
sai ky » sac ky
ve cac » va cac, vien cac
lo van » le van, so van, do van

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 ky) or (sai ky)) nang xa hoi. hieu ve cac ((lo van) OR (vo van)) hanh vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach ky) OR (sai ky)) nang xa hoi. hieu ve cac ((lo van) OR (vo van)) hanh vai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach ky) or (sai ky)) nang xa hoi. hieu ve cac ((lo van) OR (vo van)) hanh vai cua tre".
• Adding a wildcard symbol may retrieve word variants: te ((sach ky) or (sai ky)) nang xa hoi. hieu ve cac ((lo van) OR (vo van)) hanh vai cua tre*.