Perhaps you should try some spelling variations:
te sach » toc sach
cua tre » cua te, cua triet, dua tren
dinh ca » dinh cac, dinh cua, dinh cao
va dinh » van dinh, va kinh, va tinh
hieu va » lieu va, hieu qua
cac tac » cac toc, cac bac, cac dac
cuu tre » cau tren, cau treo
y nang » ky nang, ly nang, v nang
tac va » tac da, tac xa, tuc va
me hoi » le hoi

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 (cuu tre))~.
• 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 (cuu tre))*.
• 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 (cuu tre))*".