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