Perhaps you should try some spelling variations:
luoc can » luc canh, hoc can, luoc dai
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet
lang xa » lang ha, dang xay, lang van
ve cam » ve cham, ve cac, va cam
sac ky » sai ky
lo van » le van, vo van, so van
anh vi » hanh vi, anh va, anh ve
vi cua » vai cua, di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((sac ky) or (cac ky)) lang xa hoi. hieu ve cam ((luoc can) or (lo van)) anh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sac ky) OR (cac ky)) lang xa hoi. hieu ve cam ((luoc can) OR (lo van)) anh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: tu ((sac ky) or (cac ky)) lang xa hoi. hieu ve cam ((luoc can) or (lo van)) anh vi cua tre*.