Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
cua tre » cua te, cuu tre, cua triet
luc van » luoc van, luu van, duc van
cam luc » cam xuc, cau luc
hieu ve » hieu va, hieu van
lang xa » lang ha, dang xay, lang van
nang xa » nang x, nang ma, mang xa
sac ky » cac ky
ve cam » ve cham, ve cac, va cam
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: te ((sac ky) OR (sai ky)) ((nang xa) or (lang xa)) hoi. hieu ve cam luc van hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sac ky) OR (sai ky)) ((nang xa) OR (lang xa)) hoi. hieu ve cam luc van hanh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sac ky) OR (sai ky)) ((nang xa) or (lang xa)) hoi. hieu ve cam luc van hanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: te ((sac ky) OR (sai ky)) ((nang xa) or (lang xa)) hoi. hieu ve cam luc van hanh vi cua tre*.