Perhaps you should try some spelling variations:
vat thanh » dat thanh, gat thanh, tat thanh
thu sach » tu sach, thuat sach, thuoc sach
nang van » dang van, tang van, lang van
vat hanh » van hanh, va hanh, nhat hanh
te sach » toc sach
cao thu » cao thi, cac thu, ca thu
va cao » va cac, va co, va dao
ca tre » ca tren, cua tre, ca tru

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 (te sach)) ky nang van hoa. lieu va cao thu ((vat hanh) OR (vat thanh)) dan ca tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (te sach)) ky nang van hoa. lieu va cao thu ((vat hanh) OR (vat thanh)) dan ca tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu sach) or (te sach)) ky nang van hoa. lieu va cao thu ((vat hanh) OR (vat thanh)) dan ca tre".
• Adding a wildcard symbol may retrieve word variants: ((thu sach) or (te sach)) ky nang van hoa. lieu va cao thu ((vat hanh) OR (vat thanh)) dan ca tre*.