Perhaps you should try some spelling variations:
sang tai » hang tai, sang tao, tang tai
van hanh » van thanh, ban hanh, van anh
tai hai » thi hai, dai hai, tai ha
hieu su » hieu sau, tieu su, hieu so
su pham » san pham
va hanh » va thanh, va danh, ban hanh
san ky » sang ky, van ky, ban ky
dan ky » van ky
vi cua » vai cua, di cua
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: thu ((san ky) or (dan ky)) sang tai hai. hieu su pham duc ((va hanh) or (van hanh)) vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu ((san ky) OR (dan ky)) sang tai hai. hieu su pham duc ((va hanh) OR (van hanh)) vi cua te.
• Adding a wildcard symbol may retrieve word variants: thu ((san ky) or (dan ky)) sang tai hai. hieu su pham duc ((va hanh) or (van hanh)) vi cua te*.