Perhaps you should try some spelling variations:
sang dai » sang tai, lang dai, sang mai
va hanh » van hanh, va thanh, ban hanh
va danh » va dinh, va dan, dia danh
dai hoi » dai hoc, dai hai, dai moi
hieu su » hieu sau, tieu su, hieu so
can xuc » cam xuc, chat xuc, can xung
vi cua » vai cua, di cua
su can » su van, su cao, tu can
sac ky » cac ky
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((sai ky) or (sac ky)) sang dai hoi. hieu su can xuc ((va hanh) OR (va danh)) vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sai ky) OR (sac ky)) sang dai hoi. hieu su can xuc ((va hanh) OR (va danh)) vi cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sai ky) or (sac ky)) sang dai hoi. hieu su can xuc ((va hanh) OR (va danh)) vi cua te".
• Adding a wildcard symbol may retrieve word variants: tu ((sai ky) or (sac ky)) sang dai hoi. hieu su can xuc ((va hanh) OR (va danh)) vi cua te*.