Perhaps you should try some spelling variations:
cua triet » cua viet, va triet
hoc sach » hoc sinh, hoc cac, hoc anh
hanh tai » thanh tai, hang tai, han tai
su triet » su viet, su tien, ve triet
thuc va » thuc vat, thuc dan, thuc day
va hanh » van hanh, va thanh, va danh
tang ha » lang ha, tang ma, trung ha
he nam » nghe nam
y tang » ky tang, 6 tang, 7 tang
ha hoi » hoa hoi, ha noi, xa hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc sach y tang ha hoi. hieu ((he nam) or (ha nam)) thuc va hanh tai ((cua triet) OR (su triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach y tang ha hoi. hieu ((he nam) OR (ha nam)) thuc va hanh tai ((cua triet) OR (su triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc sach y tang ha hoi. hieu ((he nam) or (ha nam)) thuc va hanh tai ((cua triet) OR (su triet))".
• Adding a wildcard symbol may retrieve word variants: hoc sach y tang ha hoi. hieu ((he nam) or (ha nam)) thuc va hanh tai ((cua triet) OR (su triet))*.