Perhaps you should try some spelling variations:
thanh lap » thanh san, phan lap, thanh hai
dang xay » dang van
va thanh » gia thanh, ban thanh, va tinh
su triet » su viet, su tien, ve triet
su sach » so sach, vu sach
nang ma » tang ma, sang ma, nang cao
hieu va » lieu va, hieu qua
cac tuc » cac toc, cac tu, cac tac
tuc va » thuc va, truc va, tuc xa
lap su » lap du, lap tu, lai su

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

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