Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
va triet » va thiet, va trien, ve triet
luoc van » luoc can, luc van, luot van
hieu va » lieu va, hieu qua
va khai » van khai, va khao, va kha
luoc va » nuoc va, duoc va, loc va
nang ma » tang ma, sang ma, nang cao
ma hoi » mai hoi, xa hoi, ma hoa
sac ky » cac ky, sai ky
anh vi » hanh vi, anh va, anh ve
tu sac » tu sach, tu cac, tu san

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 va khai ((luoc van) OR (luoc va)) anh vi ((va triet) or (cua viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky nang ma hoi. hieu va khai ((luoc van) OR (luoc va)) anh vi ((va triet) OR (cua viet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky nang ma hoi. hieu va khai ((luoc van) OR (luoc va)) anh vi ((va triet) or (cua viet))".
• Adding a wildcard symbol may retrieve word variants: tu sac ky nang ma hoi. hieu va khai ((luoc van) OR (luoc va)) anh vi ((va triet) or (cua viet))*.