Perhaps you should try some spelling variations:
lang van » tang van, hoang van, giang van
dang van » hoang van, hang va
van hanh » van thanh, ban hanh, van anh
hieu va » lieu va, hieu qua
cua van » cua ban, cua vat, cua dan
cua tre » cua te, cuu tre, cua triet
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai ky
va nam » van nam, ha nam, va nay
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 ((lang van) or (dang van)) hoi. hieu va nam cua van hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky ((lang van) OR (dang van)) hoi. hieu va nam cua van hanh vi cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sac ky ((lang van) or (dang van)) hoi. hieu va nam cua van hanh vi cua tre*.