Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
cham luu » cham cuu, chat lua, phap luu
cua tre » cua te, cua triet, dua tren
cuu tre » cau tren, cau treo
luu van » cuu van, luan van, luu hanh
ve cham » va cham, ve chat, vu cham
hieu ve » hieu va, hieu van
nang ma » tang ma, sang ma, nang cao
mang xa » lang xa, mang may, dang xay
ve cac » va cac, vien cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: ve cac ky ((mang xa) or (nang ma)) hoi. hieu ve cham luu van hanh vi ((cuu tre) or (cua tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ve cac ky ((mang xa) OR (nang ma)) hoi. hieu ve cham luu van hanh vi ((cuu tre) OR (cua tre)).
• Adding a wildcard symbol may retrieve word variants: ve cac ky ((mang xa) or (nang ma)) hoi. hieu ve cham luu van hanh vi ((cuu tre) or (cua tre))*.