Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
su triet » su viet, su tien, ve triet
thanh vi » hanh vi, thanh va, thanh ve
quoc ban » quoc bao, quoc lan, quoc quan
cam quoc » cac quoc, cao quoc, nam quoc
hieu va » lieu va, hieu qua
nang ma » tang ma, sang ma, nang cao
nang xa » nang x, lang xa, mang xa
sach v » sach va, sach 2, sach vay
va cam » va cham, va cac, va cao
vi su » va su, ve su, ki 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 v) or (sach y)) ((nang xa) OR (nang ma)) hoi. hieu va cam quoc ban thanh vi su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach v) OR (sach y)) ((nang xa) OR (nang ma)) hoi. hieu va cam quoc ban thanh vi su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach v) or (sach y)) ((nang xa) OR (nang ma)) hoi. hieu va cam quoc ban thanh vi su triet".
• Adding a wildcard symbol may retrieve word variants: tu ((sach v) or (sach y)) ((nang xa) OR (nang ma)) hoi. hieu va cam quoc ban thanh vi su triet*.