Perhaps you should try some spelling variations:
nang mai » nang ma, nang tai, lang mai
van hanh » van thanh, ban hanh, van anh
tu sach » thu sach, su sach, te sach
ve cham » va cham, ve chat, vu cham
vai cua » dai cua, hai cua, lai cua
xuc van » duc van, luc van, xuc ban
mai hoi » mai khoi, dai hoi, lai hoi
y nang » ky nang, ly nang, v nang
ve cam » ve cac, va cam, ve cai
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 sach y nang mai hoi. hieu ((ve cam) or (ve cham)) xuc van hanh ((vi cua) OR (vai cua)) tuc~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang mai hoi. hieu ((ve cam) OR (ve cham)) xuc van hanh ((vi cua) OR (vai cua)) tuc.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y nang mai hoi. hieu ((ve cam) or (ve cham)) xuc van hanh ((vi cua) OR (vai cua)) tuc".
• Adding a wildcard symbol may retrieve word variants: tu sach y nang mai hoi. hieu ((ve cam) or (ve cham)) xuc van hanh ((vi cua) OR (vai cua)) tuc*.