Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
thu hanh » thu thanh, thuy hanh, thi hanh
hanh dam » thanh dam, hanh lam, hanh nam
va hanh » van hanh, va thanh, va danh
ve chat » va chat, van chat
te sach » toc sach
ve cam » ve cham, ve cac, va cam
tuc va » thuc va, truc va, tuc xa
dam va » dam van, nam va, dam ha

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