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
mai hoi » mai khoi, dai hoi, lai hoi
xuc van » duc van, luc van, xuc ban
y nang » ky nang, ly nang, v nang
ve cam » ve cham, ve cac, ve cai
va cam » va cham, va cac, va cao
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 hoi. hieu ((ve cam) or (va cam)) xuc van hanh vi cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang mai hoi. hieu ((ve cam) OR (va cam)) xuc van hanh vi cua vat*.