Perhaps you should try some spelling variations:
pham chuc » pham duc, pham huu, kham chua
ban thanh » ban hanh, ban hang
pham cuc » pham duc, pham cua, pham thuc
tu sach » thu sach, su sach, te sach
hai cua » thai cua, dai cua, hoi cua
bi tinh » vi tinh
cua tre » cua te, cuu tre, cua triet
sach ky » sac ky, sach y, sach ty
dang xa » dang xay, lang xa, dang ha
ky dang » ky nang, ky danh
hieu v » hieu va, hieu ve, hieu 2

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 dang xa hoi. hieu v ((pham cuc) OR (pham chuc)) ((bi tinh) or (ban thanh)) hai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky dang xa hoi. hieu v ((pham cuc) OR (pham chuc)) ((bi tinh) OR (ban thanh)) hai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky dang xa hoi. hieu v ((pham cuc) OR (pham chuc)) ((bi tinh) or (ban thanh)) hai cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ky dang xa hoi. hieu v ((pham cuc) OR (pham chuc)) ((bi tinh) or (ban thanh)) hai cua tre*.