Perhaps you should try some spelling variations:
thanh dat » thanh san, thanh hai, thanh van
cau tren » cu tren, dau tren, ca tren
hanh tai » thanh tai, hang tai, han tai
cuc ban » cua ban, cac ban, cuu ban
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
sang ma » tang ma, nang ma, sang tao
ky sang » ky nang, ky dang, ky tang
cac cuc » cac cuoc, cac cua, cac nuoc
ve cac » va cac, vien 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 sang ma hoi. hieu ve cac cuc ban ((thanh dat) or (hanh tai)) cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky sang ma hoi. hieu ve cac cuc ban ((thanh dat) OR (hanh tai)) cau tren.
• Adding a wildcard symbol may retrieve word variants: tu sach ky sang ma hoi. hieu ve cac cuc ban ((thanh dat) or (hanh tai)) cau tren*.