Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
hanh dai » hanh tai, vanh dai, thanh dat
hanh dao » lanh dao, thanh dat, thanh dam
hieu ve » hieu va, hieu van
cuu ban » cuu van, cua ban, cuu san
sach ky » sac ky, sach y, sach ty
tang xa » trang xa, tang ma, lang xa
ky tang » ky nang, ky dang, kho tang
cua tre » cua te, cuu tre, cua triet
ve cap » ve cac, le cap, ve cai

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 tang xa hoi. hieu ve cap cuu ban ((((hanh dai) OR (hanh dao))) or (dung tai)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky tang xa hoi. hieu ve cap cuu ban ((((hanh dai) OR (hanh dao))) OR (dung tai)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky tang xa hoi. hieu ve cap cuu ban ((((hanh dai) OR (hanh dao))) or (dung tai)) cua tre".
• Adding a wildcard symbol may retrieve word variants: thu sach ky tang xa hoi. hieu ve cap cuu ban ((((hanh dai) OR (hanh dao))) or (dung tai)) cua tre*.