Perhaps you should try some spelling variations:
va trien » va truyen, va thiet, va tuyen
va triet » va thiet, ve triet, cua triet
hanh vai » hanh vi, hanh va, hanh tai
va hanh » van hanh, va thanh, va danh
cam tuc » cam xuc, cam tu, nam thuc
su sach » so sach, vu sach
hieu ve » hieu va, hieu van
y nang » ky nang, ly nang, may nang
ma hoi » mai hoi, xa hoi, ma hoa
tuc va » thuc va, truc va, tuc xa
v nang » va nang, vu nang, van nang
ve cam » ve cham, ve cac, va cam

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

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