Perhaps you should try some spelling variations:
hanh dai » hanh tai, hanh dao, vanh dai
nang ma » tang ma, sang ma, nang cao
thi van » thi lan, thi hanh, thi nang
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 ((nang ma) or (nang x)) hoi. ((thien van) OR (thi van)) pham duc va hanh dai cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu can ky ((nang ma) OR (nang x)) hoi. ((thien van) OR (thi van)) pham duc va hanh dai cua tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu can ky ((nang ma) or (nang x)) hoi. ((thien van) OR (thi van)) pham duc va hanh dai cua tu".
• Adding a wildcard symbol may retrieve word variants: tu can ky ((nang ma) or (nang x)) hoi. ((thien van) OR (thi van)) pham duc va hanh dai cua tu*.