Perhaps you should try some spelling variations:
thanh van » thanh san, thanh toan, thanh phan
ban thanh » ban hanh, ban hang
nam duoc » nam thuoc, da duoc, dat duoc
hieu van » hieu va, thien van, lieu va
vu sach » vu bach, su sach, vu khach
lam duc » lam duoc, pham duc, lam dung
van cau » van dau, van hau, van chat
sach ky » sac ky, sach y, sach ty
nang ma » tang ma, sang ma, nang cao
nang xa » nang x, lang xa, mang xa
cau tre » cau tren, cau treo, cau tra

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 ky ((nang xa) or (nang ma)) hoi. hieu van ((lam duc) OR (nam duoc)) ban thanh van cau tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ky ((nang xa) OR (nang ma)) hoi. hieu van ((lam duc) OR (nam duoc)) ban thanh van cau tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ky ((nang xa) or (nang ma)) hoi. hieu van ((lam duc) OR (nam duoc)) ban thanh van cau tre".
• Adding a wildcard symbol may retrieve word variants: vu sach ky ((nang xa) or (nang ma)) hoi. hieu van ((lam duc) OR (nam duoc)) ban thanh van cau tre*.