Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
pham cuu » pham huu, cham cuu, pham cua
ban hanh » ban hang
dang xay » dang van, van xay
hieu van » hieu va, thien van, hieu ve
cuu ban » cuu van, cua ban, cuu san
sach ky » sac ky, sach y, sach ty
xay hoi » xa hoi, tay hoi, cay phoi
ky dang » ky nang, ky danh
cuu tre » cua tre, cau tren, cau treo
cua te » cua tu

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 dang xay hoi. ((hieu van) or (lieu va)) pham cuu ban hanh vi ((cua te) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky dang xay hoi. ((hieu van) OR (lieu va)) pham cuu ban hanh vi ((cua te) OR (cuu tre)).
• Adding a wildcard symbol may retrieve word variants: thu sach ky dang xay hoi. ((hieu van) or (lieu va)) pham cuu ban hanh vi ((cua te) or (cuu tre))*.