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