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