Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
cau tren » cu tren, dau tren, ca tren
van hanh » ban hanh, van anh, van ban
cac xuc » cam xuc, cac nuoc, chat xuc
vai cau » va cau, van cau, vai cac
sach ky » sac ky, sach y, sach ty
may hoi » may thoi, tay hoi, mai hoi
hieu va » lieu va, hieu qua
sai ky » sac ky

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 (sai ky)) mang may hoi. hieu va cac xuc ((van hanh) or (van thanh)) vai cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ky) OR (sai ky)) mang may hoi. hieu va cac xuc ((van hanh) OR (van thanh)) vai cau tren.
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) or (sai ky)) mang may hoi. hieu va cac xuc ((van hanh) or (van thanh)) vai cau tren*.