Perhaps you should try some spelling variations:
thanh vai » thanh hai, thanh van, thanh tai
ban thanh » ban hanh, ban hang
hieu van » hieu va, thien van, lieu va
cau tren » cu tren, dau tren, ca tren
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
nang ma » tang ma, sang ma, nang cao
cay dua » cay lua, ca dua, cay nua
vai cau » va cau, van cau, vai cac
ma hoi » mai hoi, xa hoi, ma hoa

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 nang ma hoi. hieu van ((cay dua) or (chay dua)) ban thanh vai cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang ma hoi. hieu van ((cay dua) OR (chay dua)) ban thanh vai cau tren.
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang ma hoi. hieu van ((cay dua) or (chay dua)) ban thanh vai cau tren*.