Perhaps you should try some spelling variations:
sang dai » sang tai, lang dai, sang mai
can xung » can bang
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
vi cua » vai cua, di cua
su can » su van, su cao, tu can
sac ky » cac ky
cua tu » cua tuc, cua su, cua cu

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 xung ((va hanh) or (va danh)) vi cua tu~.
• 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 xung ((va hanh) OR (va danh)) vi cua tu.
• Adding a wildcard symbol may retrieve word variants: tu ((sai ky) or (sac ky)) sang dai hoi. hieu su can xung ((va hanh) or (va danh)) vi cua tu*.