Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
nang xa » nang x, lang xa, mang xa
nang ma » tang ma, sang ma, nang cao
hieu ve » hieu va, hieu van
cam tuc » cam xuc, cam tu, nam thuc
tuc van » thuc van, truc van, tuc va
vai cua » dai cua, hai cua, lai cua
ve cam » ve cham, ve cac, va cam
vi 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 cac ky ((nang xa) or (nang ma)) hoi. hieu ve cam tuc van hanh ((vi cua) or (vai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu cac ky ((nang xa) OR (nang ma)) hoi. hieu ve cam tuc van hanh ((vi cua) OR (vai cua)) tre.
• Adding a wildcard symbol may retrieve word variants: tu cac ky ((nang xa) or (nang ma)) hoi. hieu ve cam tuc van hanh ((vi cua) or (vai cua)) tre*.