Perhaps you should try some spelling variations:
nam thuc » nam thuoc, am thuc, nam thu
hanh tai » thanh tai, hang tai, han tai
hieu van » hieu va, thien van, lieu va
hanh vai » hanh vi, hanh va, hanh van
ky sang » ky nang, ky dang, ky tang
thuc xa » thuc xay, tuc xa, thuc va
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai ky
ma hoi » mai hoi, ma hoa, me hoi
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sac ky sang ((ma hoi) or (xa hoi)). hieu van nam thuc xa ((hanh vai) OR (hanh tai)) cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky sang ((ma hoi) OR (xa hoi)). hieu van nam thuc xa ((hanh vai) OR (hanh tai)) cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky sang ((ma hoi) or (xa hoi)). hieu van nam thuc xa ((hanh vai) OR (hanh tai)) cua te".
• Adding a wildcard symbol may retrieve word variants: tu sac ky sang ((ma hoi) or (xa hoi)). hieu van nam thuc xa ((hanh vai) OR (hanh tai)) cua te*.