Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
cham thuc » nham thuc, pham thuc, tham thuc
van hanh » van thanh, ban hanh, van ban
hang dai » hoang dai, hang tai, hang dau
van anh » van thanh, tuan anh, van minh
sach ly » sach lo, sach ty, sach hay
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
di cua » dai cua, doi cua, de cua

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 ly) OR (sach y)) hang dai han. hieu ve cham thuc ((van hanh) or (van anh)) di cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ly) OR (sach y)) hang dai han. hieu ve cham thuc ((van hanh) OR (van anh)) di cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach ly) OR (sach y)) hang dai han. hieu ve cham thuc ((van hanh) or (van anh)) di cua triet".
• Adding a wildcard symbol may retrieve word variants: su ((sach ly) OR (sach y)) hang dai han. hieu ve cham thuc ((van hanh) or (van anh)) di cua triet*.