Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
va trien » va truyen, va thiet, va tuyen
va triet » va thiet, ve triet, cua triet
van hanh » ban hanh, van anh, van ban
hieu va » lieu va, hieu qua
cac tuc » cac toc, cac tu, cac tac
dang xa » dang xay, lang xa, dang ha
ky dang » ky nang, ky danh
sac ky » cac ky, sai ky
tu sac » tu sach, tu cac, tu san

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sac ky dang xa hoi. hieu va cac tuc ((van hanh) or (van thanh)) hai ((va triet) OR (va trien))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky dang xa hoi. hieu va cac tuc ((van hanh) OR (van thanh)) hai ((va triet) OR (va trien)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky dang xa hoi. hieu va cac tuc ((van hanh) or (van thanh)) hai ((va triet) OR (va trien))".
• Adding a wildcard symbol may retrieve word variants: tu sac ky dang xa hoi. hieu va cac tuc ((van hanh) or (van thanh)) hai ((va triet) OR (va trien))*.