Perhaps you should try some spelling variations:
nang mai » nang ma, nang tai, lang mai
tu cach » tu cac
va hanh » van hanh, va thanh, va danh
hoi cua » hoi chuc
so sach » so sanh, bo sach, co sach
mai hoi » mai khoi, dai hoi, lai hoi
hieu ve » hieu va, hieu van
hai cua » thai cua, dai cua, lai cua
bao tuc » bao thuc, dao tuc, bao luc
ve bao » te bao, va bao
tuc va » thuc va, truc va, tuc xa

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu cach) or (so sach)) ky nang mai hoi. hieu ve bao tuc va hanh ((hai cua) OR (hoi cua)) te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu cach) OR (so sach)) ky nang mai hoi. hieu ve bao tuc va hanh ((hai cua) OR (hoi cua)) te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu cach) or (so sach)) ky nang mai hoi. hieu ve bao tuc va hanh ((hai cua) OR (hoi cua)) te".
• Adding a wildcard symbol may retrieve word variants: ((tu cach) or (so sach)) ky nang mai hoi. hieu ve bao tuc va hanh ((hai cua) OR (hoi cua)) te*.