Perhaps you should try some spelling variations:
hang dai » hoang dai, hang tai, hang dau
so sach » so sanh, bo sach, co sach
ky tang » ky nang, ky dang, kho tang
tang xa » trang xa, tang ma, lang xa
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
cham tu » pham tu, cam tu, chai tu
va hang » van hang, va nang, va lang
cua tre » cua te, cuu tre, cua triet

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((((thuat toan) or (thuat song))) or (so sach)) ky tang xa hoi. hieu ve cham tu va hang dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((((thuat toan) OR (thuat song))) OR (so sach)) ky tang xa hoi. hieu ve cham tu va hang dai cua tre.
• Adding a wildcard symbol may retrieve word variants: ((((thuat toan) or (thuat song))) or (so sach)) ky tang xa hoi. hieu ve cham tu va hang dai cua tre*.