Perhaps you should try some spelling variations:
nang van » dang van, tang van, lang van
cac thuc » cach thuc, can thuc, cay thuc
dien cua » dien cuc, dien cu, tien cua
dieu cua » dieu tra
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
van hoc » van hoa
hieu va » lieu va, hieu qua
cac thu » cach thuc, cac thoi
va danh » va dinh, va dan, va hanh

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 nang van hoc. hieu va ((cac thuc) or (cac thu)) va danh ((dien cua) OR (dieu cua)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang van hoc. hieu va ((cac thuc) OR (cac thu)) va danh ((dien cua) OR (dieu cua)) triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang van hoc. hieu va ((cac thuc) or (cac thu)) va danh ((dien cua) OR (dieu cua)) triet".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang van hoc. hieu va ((cac thuc) or (cac thu)) va danh ((dien cua) OR (dieu cua)) triet*.