Perhaps you should try some spelling variations:
hieu ve » hieu va, hieu van
cac tuc » cac toc, cac tu, cac tac
va hanh » van hanh, va thanh, va danh
vai cua » lai cua, bai cua, mai cua
hai cua » thai cua, hoi cua, lai cua
tu can » tu ban, tu cac, thu canh
can ky » van ky, dan ky, ban ky
nang o » nang co, nang ho, nang ro
ve cac » va cac, vien cac
tuc va » thuc va, truc va, tuc xa
o hai » co hai, so hai, o lai

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

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