Perhaps you should try some spelling variations:
nam quoc » nam duoc, nam buoc, nam thuoc
manh hai » lanh hai, minh hai, thanh hai
ban manh » ban hanh, van manh, ban mach
quoc ban » quoc bao, quoc lan, quoc quan
tu sach » thu sach, su sach, te sach
hai cua » thai cua, dai cua, hoi cua
cua tre » cua te, cuu tre, cua triet
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
nang xa » lang xa, nang ma, mang xa

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 ((nang xa) OR (nang x)) hoi. ((hieu ve) or (lieu va)) nam quoc ban manh hai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky ((nang xa) OR (nang x)) hoi. ((hieu ve) OR (lieu va)) nam quoc ban manh hai cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky ((nang xa) OR (nang x)) hoi. ((hieu ve) or (lieu va)) nam quoc ban manh hai cua tre*".