Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
te sach » toc sach
hieu va » lieu va, hieu qua
cac tac » cac toc, cac bac, cac dac
va dinh » van dinh, va kinh, va tinh
dinh ca » dinh cac, dinh cua, dinh cao
cua tre » cua te, cuu tre, dua tren
y nang » ky nang, ly nang, v nang
me hoi » le hoi
tac va » tac da, tac xa, tuc 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 y nang ((me hoi) or (ma hoa)). hieu va cac tac va dinh ca ((cua tre) OR (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach y nang ((me hoi) OR (ma hoa)). hieu va cac tac va dinh ca ((cua tre) OR (cua triet))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach y nang ((me hoi) or (ma hoa)). hieu va cac tac va dinh ca ((cua tre) OR (cua triet))*".