Perhaps you should try some spelling variations:
ve triet » va trien, su triet
sach thu » sach thue, sach thieu, sach tham
thu hanh » thuc hanh, thu thanh, thuy hanh
hieu van » hieu va, thien van, lieu va
va triet » va thiet, va trien, cua triet
tu sach » thu sach, su sach, te sach
va hanh » van hanh, va thanh, va danh
van cam » van nam, van lam, van cau
hanh xa » hanh va, hanh ma, hanh xu
va dan » ca dan, va dao, va dau

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