Perhaps you should try some spelling variations:
dau tren » dau tien, dat tren, dau tieng
hanh vai » hanh vi, hanh va, hanh tai
ban hanh » ban hang
vai dau » va dau, van dau, xvii dau
thu sac » thu sach, thu san, thu xac
nam dia » nam da, nam dinh, nam giao
sac ky » cac ky, sai ky
nam di » nam doi, nam da, nam do
ma hoi » mai hoi, xa hoi, me hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sac ky nang ((ma hoi) or (ma hoa)). lieu va ((nam dia) OR (nam di)) ban hanh vai dau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sac ky nang ((ma hoi) OR (ma hoa)). lieu va ((nam dia) OR (nam di)) ban hanh vai dau tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sac ky nang ((ma hoi) or (ma hoa)). lieu va ((nam dia) OR (nam di)) ban hanh vai dau tren".
• Adding a wildcard symbol may retrieve word variants: thu sac ky nang ((ma hoi) or (ma hoa)). lieu va ((nam dia) OR (nam di)) ban hanh vai dau tren*.