Perhaps you should try some spelling variations:
hanh lai » hanh lam, hanh tai, thanh lap
van hanh » van thanh, ban hanh, van anh
chat duc » chat xuc, chat doc, chet duoc
ve chat » va chat, van chat
lai cua » dai cua, hai cua, lai chau
duc van » duc va, duc tan, duc manh
tu sach » thu sach, su sach, te sach
hieu ve » hieu va, hieu van
mai hoi » mai khoi, dai hoi, lai hoi
ky dang » ky danh
ky sang » ky tang, duy sang
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: tu sach ((ky sang) or (((ky dang) OR (ky nang)))) mai hoi. hieu ve chat duc van hanh lai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((ky sang) OR (((ky dang) OR (ky nang)))) mai hoi. hieu ve chat duc van hanh lai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((ky sang) or (((ky dang) OR (ky nang)))) mai hoi. hieu ve chat duc van hanh lai cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ((ky sang) or (((ky dang) OR (ky nang)))) mai hoi. hieu ve chat duc van hanh lai cua tre*.