Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
xay hoi » xa hoi, tay hoi, cay phoi
thai ky » thoi ky, than ky, thai ly
hieu ve » hieu va, hieu van
xuc van » duc van, luc van, vuc van
cua tre » cuu tre, cua triet, dua tren
tai ky » trai ky, sai ky, dai ky
va xay » va xac
ve cam » ve cham, ve cac, va cam
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: te ((tai ky) OR (thai ky)) va xay hoi. hieu ve cam xuc van hanh vi ((cua tre) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((tai ky) OR (thai ky)) va xay hoi. hieu ve cam xuc van hanh vi ((cua tre) OR (cua te)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((tai ky) OR (thai ky)) va xay hoi. hieu ve cam xuc van hanh vi ((cua tre) or (cua te))".
• Adding a wildcard symbol may retrieve word variants: te ((tai ky) OR (thai ky)) va xay hoi. hieu ve cam xuc van hanh vi ((cua tre) or (cua te))*.