Perhaps you should try some spelling variations:
thanh van » thanh san, thanh toan, thanh phan
ban thanh » ban hanh, ban hang
hieu van » hieu va, thien van, lieu va
lam duc » lam duoc, pham duc, nam duoc
sach ty » sach y, sach tu, sach thu
nang xa » nang x, lang xa, mang xa
duc ban » duc tan, duc van, dua ban
nang ma » tang ma, sang ma, nang cao
sach ky » sac ky, sach y, sach kem
van lam » van nam
van cu » van cau, van chu, van cua
cu tre » cu tren, cua tre, cuu tre

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