Perhaps you should try some spelling variations:
dinh dien » tinh dien, kinh dien, dich dien
toc sach » hoc sach, doc sach, thuoc sach
nang ma » tang ma, sang ma, nang cao
hieu va » lieu va, hieu qua
va cham » va chat, va tham
y nang » ky nang, ly nang, v nang
ma hoi » mai hoi, xa hoi, ma hoa
soc va » loc va, doc va, goc va
cuc te » cua te, cuc tieu
thue » thu, thuc, thuy

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach y nang ma hoi. hieu va cham ((soc va) or (hoc va)) dinh dien ((cuc te) OR (cuc thue))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach y nang ma hoi. hieu va cham ((soc va) OR (hoc va)) dinh dien ((cuc te) OR (cuc thue)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach y nang ma hoi. hieu va cham ((soc va) or (hoc va)) dinh dien ((cuc te) OR (cuc thue))".
• Adding a wildcard symbol may retrieve word variants: toc sach y nang ma hoi. hieu va cham ((soc va) or (hoc va)) dinh dien ((cuc te) OR (cuc thue))*.