Perhaps you should try some spelling variations:
va trien » va truyen, va thiet, va tuyen
su triet » su viet, su tien, ve triet
nang dai » nang dau, nang tai, lang dai
sach ky » sac ky, sach ty, sach kem
va hanh » van hanh, va thanh, va danh
cam tuc » cam xuc, cam tu, nam thuc
hieu va » lieu va, hieu qua
dai hoi » dai hoc, dai hai, dai moi
tuc va » thuc va, truc va, tuc xa
va cam » va cham, va cac, va cao

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

• Performing a fuzzy search may retrieve terms with similar spellings: so ((sach ky) OR (sach y)) nang dai hoi. hieu va cam tuc va hanh vi ((su triet) or (va trien))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so ((sach ky) OR (sach y)) nang dai hoi. hieu va cam tuc va hanh vi ((su triet) OR (va trien))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so ((sach ky) OR (sach y)) nang dai hoi. hieu va cam tuc va hanh vi ((su triet) or (va trien))*".