Perhaps you should try some spelling variations:
ve triet » va trien, su triet
thi hanh » thi thanh
hanh dam » thanh dam, hanh lam, hanh nam
sach thi » sach thu, sach tai, sach thieu
va hanh » van hanh, va thanh, va danh
tu sach » thu sach, su sach, te sach
ve cac » va cac, vien cac
xuc va » duc va, tuc va, luc va
xu hoi » lu hoi, vu hoi, xu voi
dam ve » dap ve, dau ve, dam me
ve cai » va cai, ve tai, ve cau

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