Perhaps you should try some spelling variations:
thanh dai » thanh hai, thanh tai, thanh dat
cuu tre » cua tre, cau tren, cau treo
dai cuu » dai cua, dai huu
duc van » duc va, duc tan, duc manh
duc ban » duc tan, dua ban, duc man
hieu ve » hieu va, hieu van
tang ma » mang may, tang van
tang xa » trang xa, lang xa, tang ha
sac ky » cac ky, sai ky
ve cam » ve cham, ve cac, va cam
su sac » su sach, su cac, su xac

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: su sac ky ((tang xa) or (tang ma)) hoi. hieu ve cam ((duc ban) OR (duc van)) thanh dai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sac ky ((tang xa) OR (tang ma)) hoi. hieu ve cam ((duc ban) OR (duc van)) thanh dai cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sac ky ((tang xa) or (tang ma)) hoi. hieu ve cam ((duc ban) OR (duc van)) thanh dai cuu tre".
• Adding a wildcard symbol may retrieve word variants: su sac ky ((tang xa) or (tang ma)) hoi. hieu ve cam ((duc ban) OR (duc van)) thanh dai cuu tre*.