Perhaps you should try some spelling variations:
va triet » va thiet, va trien, ve triet
vien cac » vien bach, vien dai, vien da
hanh dam » thanh dam, hanh lam, hanh nam
sach tai » sach bai, sach tham, sach dao
sach thi » sach thu, sach thieu, sach tham
va hanh » van hanh, va thanh, va danh
thuc va » thuc vat, thuc dan, thuc day
hanh xa » hanh va, hanh ma, hanh xu
ve cam » ve cham, ve cac, va cam
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: tu ((sach thi) OR (sach tai)) hanh xa hoi. hieu ((ve cam) or (vien cac)) thuc va hanh dam va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach thi) OR (sach tai)) hanh xa hoi. hieu ((ve cam) OR (vien cac)) thuc va hanh dam va triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach thi) OR (sach tai)) hanh xa hoi. hieu ((ve cam) or (vien cac)) thuc va hanh dam va triet".
• Adding a wildcard symbol may retrieve word variants: tu ((sach thi) OR (sach tai)) hanh xa hoi. hieu ((ve cam) or (vien cac)) thuc va hanh dam va triet*.