Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
thien van » thi van
cau tren » cu tren, dau tren, ca tren
thanh vi » hanh vi, thanh va, thanh ve
xuc ban » duc ban, cuc ban, quoc ban
nam xuc » cam xuc, nam xua, nam thuc
sach ky » sach y, sach ty, sach kem
sac ky » cac ky, sai ky
vi cau » va cau, ve cau, di cau

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 ky) OR (sac ky)) ((mang may) or (nang cao)) hoi. thien van nam xuc ban thanh vi cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ky) OR (sac ky)) ((mang may) OR (nang cao)) hoi. thien van nam xuc ban thanh vi cau tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ky) OR (sac ky)) ((mang may) or (nang cao)) hoi. thien van nam xuc ban thanh vi cau tren".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) OR (sac ky)) ((mang may) or (nang cao)) hoi. thien van nam xuc ban thanh vi cau tren*.