Perhaps you should try some spelling variations:
va trien » va truyen, va thiet, va tuyen
va thanh » gia thanh, ban thanh, va tinh
cam duc » cam xuc, cao duc, pham duc
doc sac » doc sach, dac sac, hoc sach
nang ma » tang ma, sang ma, nang cao
hieu va » lieu va, hieu qua
va hanh » van hanh, va danh, ban hanh
va cam » va cham, va cac, va cao
sac ky » cac ky, sai ky
ma hoi » mai hoi, xa hoi, ma hoa
cua te » cua tu

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: doc sac ky nang ma hoi. hieu va cam duc ((va hanh) OR (va thanh)) vi ((cua te) OR (va trien))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc sac ky nang ma hoi. hieu va cam duc ((va hanh) OR (va thanh)) vi ((cua te) or (va trien))~".
• Adding a wildcard symbol may retrieve word variants: doc sac ky nang ma hoi. hieu va cam duc ((va hanh) OR (va thanh)) vi ((cua te) or (va trien))*.