Perhaps you should try some spelling variations:
thien van » thi van
van pham » san pham, van phan, van phat
hanh dai » hanh tai, hanh dao, vanh dai
tang ma » mang may, tang van
va hanh » van hanh, va thanh, va danh
tu can » tu ban, tu cac, thu canh
can ky » van ky, dan ky, ban 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 can ky ((tang ma) or (nang x)) hoi. thien van pham duc va hanh dai cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu can ky ((tang ma) OR (nang x)) hoi. thien van pham duc va hanh dai cua tu.
• Adding a wildcard symbol may retrieve word variants: tu can ky ((tang ma) or (nang x)) hoi. thien van pham duc va hanh dai cua tu*.