Perhaps you should try some spelling variations:
pham thuc » phap thuc, pham chuc, nham thuc
dan thanh » dang thanh, danh thanh, ban thanh
ban hanh » ban hang
thu sach » tu sach, thuat sach, thuoc sach
hieu ve » hieu va, hieu van
ve pham » vi pham, v pham, ve phan
sach ky » sac ky, sach y, sach ty
co hoi » co loi
di cua » dai cua, doi cua, de cua
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 nang ((co hoi) OR (co hoc)). hieu ve pham thuc ((ban hanh) or (dan thanh)) di cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky nang ((co hoi) OR (co hoc)). hieu ve pham thuc ((ban hanh) OR (dan thanh)) di cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky nang ((co hoi) OR (co hoc)). hieu ve pham thuc ((ban hanh) or (dan thanh)) di cua te".
• Adding a wildcard symbol may retrieve word variants: thu sach ky nang ((co hoi) OR (co hoc)). hieu ve pham thuc ((ban hanh) or (dan thanh)) di cua te*.