Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
toc sach » hoc sach, doc sach, thuoc sach
vat hanh » vat thanh, van hanh, va hanh
hanh tai » thanh tai, hang tai, han tai
tang ha » lang ha, tang ma, trung ha
tai cua » thai cua, tai cuc, tri cua
y tang » ky tang, 6 tang, 7 tang
ha hoi » hoa hoi, ha noi, xa hoi
he nam » nghe nam

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach y tang ha hoi. hieu ((he nam) or (ha nam)) thuc vat hanh tai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach y tang ha hoi. hieu ((he nam) OR (ha nam)) thuc vat hanh tai cua triet.
• Adding a wildcard symbol may retrieve word variants: toc sach y tang ha hoi. hieu ((he nam) or (ha nam)) thuc vat hanh tai cua triet*.