Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
va trien » va truyen, va thiet, va tuyen
va hanh » van hanh, va thanh, va danh
cac xuc » cam xuc, cac nuoc, chat xuc
sach ky » sac ky, sach y, sach ty
su sach » so sach, vu sach
nang ma » tang ma, nang cao, mang may
sang ma » tang ma, sang tao, mang may
qua cac » cua cac
xuc va » duc va, tuc va, luc va

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 ky ((nang ma) OR (sang ma)) hoi. hieu qua cac xuc va hanh vi ((cua triet) or (va trien))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky ((nang ma) OR (sang ma)) hoi. hieu qua cac xuc va hanh vi ((cua triet) OR (va trien)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky ((nang ma) OR (sang ma)) hoi. hieu qua cac xuc va hanh vi ((cua triet) or (va trien))".
• Adding a wildcard symbol may retrieve word variants: su sach ky ((nang ma) OR (sang ma)) hoi. hieu qua cac xuc va hanh vi ((cua triet) or (va trien))*.