Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
nhan dien » nhan vien, nhan dieu, nhan dan
dien cua » dieu cua, dien cuc, dien cu
hieu ve » hieu va, hieu van
tu sach » thu sach, te sach, tu cach
nang ho » nang hoc, nang co, tang ho
su sach » so sach, vu sach
ho hoi » hoc hoi, hoa hoi, hoi hoi
luc va » duc va, loc va
tuc va » thuc va, truc va, tuc xa
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) or (su sach)) ky nang ho hoi. hieu ve cau ((luc va) OR (tuc va)) nhan dien cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) ky nang ho hoi. hieu ve cau ((luc va) OR (tuc va)) nhan dien cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (su sach)) ky nang ho hoi. hieu ve cau ((luc va) OR (tuc va)) nhan dien cua triet".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (su sach)) ky nang ho hoi. hieu ve cau ((luc va) OR (tuc va)) nhan dien cua triet*.