Perhaps you should try some spelling variations:
dau tren » dau tien, dat tren, dau tieng
hanh vai » hanh vi, hanh va, hanh tai
sang ma » tang ma, sang tao, mang may
vai dau » va dau, van dau, xvii dau
nang ma » tang ma, nang cao, mang may
va hanh » van hanh, va thanh, va danh
ve cac » va cac, vien cac
thu va » thuc va, thue va, tu va
tu san » thu san, tu ban, tu can
san ky » sang ky, van ky, dan ky
ve cam » ve cham, va cam, ve cai

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 ma)) hoi. hieu ((ve cam) OR (ve cac)) thu va hanh vai dau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu san ky ((sang ma) OR (nang ma)) hoi. hieu ((ve cam) OR (ve cac)) thu va hanh vai dau tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu san ky ((sang ma) or (nang ma)) hoi. hieu ((ve cam) OR (ve cac)) thu va hanh vai dau tren".
• Adding a wildcard symbol may retrieve word variants: tu san ky ((sang ma) or (nang ma)) hoi. hieu ((ve cam) OR (ve cac)) thu va hanh vai dau tren*.