Perhaps you should try some spelling variations:
pham sach » pham anh, nam sach, pham hanh
van thanh » van tuan
ban thanh » ban hanh, ban hang
ky dang » ky nang
ky danh » ky anh
hieu vu » hieu va, hieu ve, hieu su
vu pham » su pham, vi pham, vu kham
san cua » sang cua, ban cua, dan cua
cua tre » cua te, cuu tre, cua triet
tu san » thu san, tu ban, tu can

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu san ((ky dang) OR (ky danh)) xa hoi. hieu vu pham sach ((van thanh) or (ban thanh)) san cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu san ((ky dang) OR (ky danh)) xa hoi. hieu vu pham sach ((van thanh) OR (ban thanh)) san cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu san ((ky dang) OR (ky danh)) xa hoi. hieu vu pham sach ((van thanh) or (ban thanh)) san cua tre".
• Adding a wildcard symbol may retrieve word variants: tu san ((ky dang) OR (ky danh)) xa hoi. hieu vu pham sach ((van thanh) or (ban thanh)) san cua tre*.