Perhaps you should try some spelling variations:
may trinh » may tinh, lap trinh, quy trinh
toc sach » hoc sach, doc sach, thuoc sach
hieu van » hieu va, thien van, lieu va
dang xay » dang van, van xay
xay hoi » xa hoi, tay hoi, cay phoi
hieu ve » hieu va
sach ky » sac ky, sach y, sach ty
xuc may » xuc hay, truc may, phuc may
ky dang » ky nang, ky danh

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 ky dang xay hoi. ((hieu ve) or (hieu van)) cam xuc may trinh ((ve su) OR (va su)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ky dang xay hoi. ((hieu ve) OR (hieu van)) cam xuc may trinh ((ve su) OR (va su)) triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ky dang xay hoi. ((hieu ve) or (hieu van)) cam xuc may trinh ((ve su) OR (va su)) triet".
• Adding a wildcard symbol may retrieve word variants: toc sach ky dang xay hoi. ((hieu ve) or (hieu van)) cam xuc may trinh ((ve su) OR (va su)) triet*.