Perhaps you should try some spelling variations:
thanh doi » thanh loi, thanh moi, thanh do
su triet » su viet, su tien, ve triet
thu sach » thuat sach, thuoc sach, thu hoach
luoc gia » quoc gia, luc gia, luong gia
cau luoc » cau luc, muu luoc, hau loc
dang xay » dang van, van xay
tu sach » su sach, te sach, tu cach
xay hoi » xa hoi, tay hoi, cay phoi
ky dang » ky nang, ky danh
hieu ve » hieu va, hieu van
doi su » oi su, don su, voi su

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

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