Perhaps you should try some spelling variations:
ve triet » va trien, su triet
thu sach » thuat sach, thuoc sach, thu hoach
va triet » va thiet, va trien, cua triet
hanh vai » hanh vi, hanh va, hanh tai
van hanh » van thanh, ban hanh, van anh
tu sach » su sach, te sach, tu cach
hieu va » lieu va, hieu qua
dang xa » dang xay, lang xa, dang ha
ky dang » ky nang, ky danh
tu van » tu va
cac tu » cac thu, cach tu, cac du

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