Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
nang xa » nang x, nang ma, mang xa
lang xa » lang ha, dang xay, lang van
hieu ve » hieu va, hieu van
cam duc » cam xuc, cao duc, pham duc
duc van » duc va, duc tan, duc manh
tai ky » thai ky, trai ky, sai ky
ve cam » ve cham, ve cac, va cam
de cua » le cua, dieu cua
te cua » tue cua, le 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 tai ky ((nang xa) or (lang xa)) hoi. hieu ve cam duc van hanh ((de cua) or (te cua)) te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te tai ky ((nang xa) OR (lang xa)) hoi. hieu ve cam duc van hanh ((de cua) OR (te cua)) te.
• Adding a wildcard symbol may retrieve word variants: te tai ky ((nang xa) or (lang xa)) hoi. hieu ve cam duc van hanh ((de cua) or (te cua)) te*.