Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
te sach » toc sach
sach ky » sac ky, sach y, sach ty
nang ma » tang ma, nang cao, mang may
sang ma » tang ma, sang tao, mang may
hieu ve » hieu va, hieu van
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, dua tren
ve cam » ve cham, ve cac, va cam
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: te sach ky ((nang ma) OR (sang ma)) hoi. hieu ve cam xuc va hanh vi ((cua tre) or (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky ((nang ma) OR (sang ma)) hoi. hieu ve cam xuc va hanh vi ((cua tre) OR (cua triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky ((nang ma) OR (sang ma)) hoi. hieu ve cam xuc va hanh vi ((cua tre) or (cua triet))".
• Adding a wildcard symbol may retrieve word variants: te sach ky ((nang ma) OR (sang ma)) hoi. hieu ve cam xuc va hanh vi ((cua tre) or (cua triet))*.