Perhaps you should try some spelling variations:
thu thanh » thu thang, tu thanh, thuan thanh
va triet » va thiet, va trien, ve triet
thu hanh » thuc hanh, thuy hanh, thi hanh
hanh nam » thanh nam, hanh lam, hanh ngay
va hanh » van hanh, va thanh, va danh
truc va » thuc va, thuc vat, trung va
te sach » toc sach
va cam » va cham, va cac, va cao
ve cam » ve cham, ve cac, ve cai

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ((thu hanh) OR (thu thanh)) xa hoi. hieu ((ve cam) or (va cam)) truc va hanh nam va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((thu hanh) OR (thu thanh)) xa hoi. hieu ((ve cam) OR (va cam)) truc va hanh nam va triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((thu hanh) OR (thu thanh)) xa hoi. hieu ((ve cam) or (va cam)) truc va hanh nam va triet".
• Adding a wildcard symbol may retrieve word variants: te sach ((thu hanh) OR (thu thanh)) xa hoi. hieu ((ve cam) or (va cam)) truc va hanh nam va triet*.