Perhaps you should try some spelling variations:
dau tieng » dau tien, cau tieng, day tieng
hanh vai » hanh vi, hanh va, hanh tai
van hanh » van thanh, ban hanh, van anh
sang ma » tang ma, nang ma, sang tao
vai dau » va dau, van dau, xvii dau
thu van » thuc van, thuy van, tu van
tu san » thu san, tu ban, tu can
va cam » va cham, va cac, va cao
san ky » sang ky, van ky, dan ky
ve cai » va cai, ve cac, ve tai

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu san ky ((sang ma) or (nang cao)) hoi. hieu ((ve cai) or (va cam)) thu van hanh vai dau tieng~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu san ky ((sang ma) OR (nang cao)) hoi. hieu ((ve cai) OR (va cam)) thu van hanh vai dau tieng.
• Adding a wildcard symbol may retrieve word variants: tu san ky ((sang ma) or (nang cao)) hoi. hieu ((ve cai) or (va cam)) thu van hanh vai dau tieng*.