Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
pham cuc » pham chuc, pham cua, pham thuc
ban hanh » ban hang
hieu van » hieu va, thien van, lieu va
cuu tre » cua tre, cau tren, cau treo
sach ky » sac ky, sach y, sach ty
dang xa » dang xay, lang xa, dang ha
ky dang » ky nang, ky danh
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 xa hoi. hieu van ((pham cuc) OR (pham duc)) 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 xa hoi. hieu van ((pham cuc) OR (pham duc)) ban hanh vi ((cua te) OR (cuu tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky dang xa hoi. hieu van ((pham cuc) OR (pham duc)) ban hanh vi ((cua te) or (cuu tre))".
• Adding a wildcard symbol may retrieve word variants: thu sach ky dang xa hoi. hieu van ((pham cuc) OR (pham duc)) ban hanh vi ((cua te) or (cuu tre))*.