Perhaps you should try some spelling variations:
ve triet » va trien, su triet
cham duc » pham duc, cham soc, pham duy
va triet » va thiet, va trien, cua triet
quan vai » quan vi, quan tai, quan hai
van quan » van ban
duc van » duc va, duc tan, duc manh
tu sach » thu sach, su sach, te sach
hieu va » lieu va, hieu qua
va cham » va chat, va tham
y nang » ky nang, ly nang, may nang
ma hoi » mai hoi, xa hoi, ma hoa
v nang » va nang, vu nang, van nang

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

• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((y nang) OR (v nang)) ma hoi. hieu va cham duc van quan vai ((va triet) OR (ve triet))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((y nang) or (v nang)) ma hoi. hieu va cham duc van quan vai ((va triet) OR (ve triet))~".
• Adding a wildcard symbol may retrieve word variants: tu sach ((y nang) or (v nang)) ma hoi. hieu va cham duc van quan vai ((va triet) OR (ve triet))*.