Perhaps you should try some spelling variations:
cham thuc » nham thuc, pham thuc, tham thuc
thuat san » thuat toan, thuat song, thuat lanh
hang lai » hang tai, hang hai, hang loi
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
thuc va » thuc vat, thuc dan, thuc day
va hang » van hang, va nang, va lang
lai cua » dai cua, hai cua, lai chau
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 san) or (so sach)) ky tang xa hoi. hieu ve cham thuc va hang lai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thuat san) OR (so sach)) ky tang xa hoi. hieu ve cham thuc va hang lai cua tre.
• Adding a wildcard symbol may retrieve word variants: ((thuat san) or (so sach)) ky tang xa hoi. hieu ve cham thuc va hang lai cua tre*.