Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
bao truc » bao thuc, ba truc, vao truc
nang dai » nang dau, nang tai, lang dai
hai cua » thai cua, hoi cua, lai cua
va danh » va dinh, va dan, va hanh
truc va » thuc va, thuc vat, trung va
tu cach » tu cac
van bao » van ban, van dao
dai hoi » dai hoc, dai hai, dai moi
so sach » so sanh, bo sach, co sach

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