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
hanh va » hang va, hanh vi
va hanh » van hanh, va thanh, va danh
thuc va » thuc vat, thuc dan, thuc day
ve cham » va cham, ve chat, vu cham
tu sach » thu sach, su sach, te sach
hanh xa » hanh ma, hanh xu, canh xa
ve cam » va cam, ve cai, ve cau
ve cac » va cac, vien cac
va ve » va de, va le, va vi

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