Perhaps you should try some spelling variations:
vien dai » hien dai
nang ma » tang ma, sang ma, nang cao
thuc va » thuc vat, thuc dan, thuc day
va hanh » van hanh, va thanh, va danh
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai ky
ma hoi » mai hoi, xa hoi, ma hoa
vi cua » vai cua, di cua
de cua » le cua, te cua, dieu cua

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 nang ma hoi. hieu ((vien bach) or (vien dai)) thuc va hanh ((vi cua) or (de cua)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky nang ma hoi. hieu ((vien bach) OR (vien dai)) thuc va hanh ((vi cua) OR (de cua)) triet.
• Adding a wildcard symbol may retrieve word variants: tu sac ky nang ma hoi. hieu ((vien bach) or (vien dai)) thuc va hanh ((vi cua) or (de cua)) triet*.