Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
thai cua » than cua, tai cuc, dai cua
nang xa » nang x, lang xa, nang ma
tang ma » mang may, tang van
hieu ve » hieu va, hieu van
cam duc » cam xuc, cao duc, pham duc
duc van » duc va, duc tan, duc manh
ve cam » ve cham, ve cac, va cam

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

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