Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
danh hai » dang hai, lanh hai, manh hai
hieu ve » hieu va, hieu van
duoc va » nuoc va, duc va, duong va
duoc ma » duoc lam
ky sang » ky dang, ky tang, duy sang
hai cua » thai cua, dai cua, hoi cua
cua tre » cua te, cuu tre, cua triet
ma hoi » mai hoi, xa hoi, ma hoa
ve che » va che, ke che, de che

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ((ky sang) or (ky nang)) ma hoi. hieu ve che ((duoc va) OR (duoc ma)) danh hai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ((ky sang) OR (ky nang)) ma hoi. hieu ve che ((duoc va) OR (duoc ma)) danh hai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ((ky sang) or (ky nang)) ma hoi. hieu ve che ((duoc va) OR (duoc ma)) danh hai cua tre".
• Adding a wildcard symbol may retrieve word variants: thu sach ((ky sang) or (ky nang)) ma hoi. hieu ve che ((duoc va) OR (duoc ma)) danh hai cua tre*.