Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
vien cua » viec cua, dien cua, tien cua
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
tu sach » thu sach, su sach, te sach
hoa hoi » khoa hoi, hoa hoc, hoa doi
luc va » duc va, loc va
tuc va » thuc va, truc va, tuc xa
ho hoi » hoc hoi, hoi hoi, co hoi
ve cau » ke cau, va cau, ve cac

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 ky nang ((ho hoi) or (hoa hoi)). hieu ve cau ((luc va) OR (tuc va)) nhan vien cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang ((ho hoi) OR (hoa hoi)). hieu ve cau ((luc va) OR (tuc va)) nhan vien cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang ((ho hoi) or (hoa hoi)). hieu ve cau ((luc va) OR (tuc va)) nhan vien cua triet".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang ((ho hoi) or (hoa hoi)). hieu ve cau ((luc va) OR (tuc va)) nhan vien cua triet*.