Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
van dinh » van minh, van dich, xuan dinh
dang xay » dang van, van xay
va dinh » va kinh, va tinh, vu dinh
hieu ve » hieu va, hieu van
xay hoi » xa hoi, tay hoi, cay phoi
ky dang » ky nang, ky danh
te sach » toc sach
te sac » te cac, te san
ve am » va am
de su » den su, ve su, de tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((te sac) or (te sach)) ky dang xay hoi. hieu ve am thuc ((va dinh) OR (van dinh)) de su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sac) OR (te sach)) ky dang xay hoi. hieu ve am thuc ((va dinh) OR (van dinh)) de su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sac) or (te sach)) ky dang xay hoi. hieu ve am thuc ((va dinh) OR (van dinh)) de su triet".
• Adding a wildcard symbol may retrieve word variants: ((te sac) or (te sach)) ky dang xay hoi. hieu ve am thuc ((va dinh) OR (van dinh)) de su triet*.