Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
phuc van » thuc van, phuc va, chuc van
cau phuc » cau truc, chau phu, huu phuc
vai van » hai van, mai van, van van
sach ty » sach y, sach tu, sach thu
vu sach » vu bach, su sach, vu khach
nang ma » tang ma, sang ma, nang cao
nang xa » nang x, lang xa, mang xa
qua cau » quan cau, qua cac, qua ca
vai va » mai va, dai va, hai va

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: vu sach ty ((nang xa) OR (nang ma)) hoi. hieu qua cau phuc van hanh ((vai va) OR (vai van)) triet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ty ((nang xa) OR (nang ma)) hoi. hieu qua cau phuc van hanh ((vai va) or (vai van)) triet~".
• Adding a wildcard symbol may retrieve word variants: vu sach ty ((nang xa) OR (nang ma)) hoi. hieu qua cau phuc van hanh ((vai va) or (vai van)) triet*.