Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
tinh dai » trinh dai, tinh da, tinh hai
mai khoi » mai khoa, tai khoa, cac khoi
va tinh » may tinh
cac luc » cau luc, coc luc, cac nuoc
sach ty » sach y, sach tu, sach thu
su sach » so sach, vu sach
mai hoi » dai hoi, lai hoi, mai doi
ty nang » ky nang, ty xang, ty hang
hieu ve » hieu va, hieu van
ve cac » va cac, vien cac
luc va » duc va, tuc va, loc va
cua te » cua tu

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ty nang ((mai hoi) OR (mai khoi)). hieu ve cac luc va tinh dai ((cua te) or (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty nang ((mai hoi) OR (mai khoi)). hieu ve cac luc va tinh dai ((cua te) OR (cua triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ty nang ((mai hoi) OR (mai khoi)). hieu ve cac luc va tinh dai ((cua te) or (cua triet))".
• Adding a wildcard symbol may retrieve word variants: su sach ty nang ((mai hoi) OR (mai khoi)). hieu ve cac luc va tinh dai ((cua te) or (cua triet))*.