Perhaps you should try some spelling variations:
dau tren » dau tien, dat tren, dau tieng
nang ma » tang ma, sang ma, nang cao
ca tren » cau tren, cu tren, la tren
tinh di » tinh doi, trinh di, tinh da
duc may » duc mau, duc man, duc manh
tu san » thu san, tu ban, tu can
va cao » va cac, va co, va dao
san ky » sang ky, van ky, dan ky
va cam » va cham, va cac, va cai
ma hoi » mai hoi, xa hoi, ma hoa

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 nang ma hoi. hieu ((va cam) OR (va cao)) duc may tinh di ((ca tren) or (dau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu san ky nang ma hoi. hieu ((va cam) OR (va cao)) duc may tinh di ((ca tren) OR (dau tren))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu san ky nang ma hoi. hieu ((va cam) OR (va cao)) duc may tinh di ((ca tren) or (dau tren))*".