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
van cua » vang cua, ban cua, dan cua
dua ban » dia ban, cua ban, qua ban
cam dua » ca dua, cay dua, chay dua
van cam » van nam, van lam, van cau
tu sach » thu sach, su sach, tu cach
sang ma » tang ma, sang tao, mang may
nang ma » tang ma, nang cao, mang may
te sach » toc sach
cua tre » cua te, cuu tre, cua triet

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) or (te sach)) ky ((nang ma) OR (sang ma)) hoa. hieu van cam dua ban thanh van cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (te sach)) ky ((nang ma) OR (sang ma)) hoa. hieu van cam dua ban thanh van cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (te sach)) ky ((nang ma) OR (sang ma)) hoa. hieu van cam dua ban thanh van cua tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (te sach)) ky ((nang ma) OR (sang ma)) hoa. hieu van cam dua ban thanh van cua tre*.