Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
thanh va » thanh van, hanh va, thanh ha
xa thanh » va thanh, ha thanh, ta thanh
vien da » vien dai, hien dai
sach ty » sach y, sach tu, sach thu
tu sach » thu sach, su sach, te sach
ty nang » ky nang, ty xang, ty hang
co hoi » co hoc, co loi
ve cac » va cac, vien cac
o hoi » o hoc, o hai, o hoa

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 ty nang ((o hoi) or (co hoi)). hieu ((ve cac) or (vien da)) tuc xa thanh va su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang ((o hoi) OR (co hoi)). hieu ((ve cac) OR (vien da)) tuc xa thanh va su triet.
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang ((o hoi) or (co hoi)). hieu ((ve cac) or (vien da)) tuc xa thanh va su triet*.