Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
dang xay » dang van, van xay
tinh va » tich va, trinh van, trinh vat
xa tinh » va tinh, ha tinh, ca tinh
coc tuc » coc luc, hoc thuc, doc thuc
hieu va » lieu va, hieu qua
vu sach » vu bach, vu khach
xay hoi » xa hoi, tay hoi, cay phoi
ky dang » ky nang, ky danh
su sach » so sach
hieu ve » hieu van

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

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