Perhaps you should try some spelling variations:
cua triet » cua viet, va triet
su triet » su viet, su tien, ve triet
nam thuc » nam thuoc, am thuc, nam thu
van hanh » van thanh, ban hanh, van anh
vat hanh » vat thanh, va hanh, nhat hanh
lang hoa » hang hoa, lang ha, nang hoa
hieu he » hieu ve, hiem he, hieu le
hoa hoi » khoa hoi, hoa hoc, hoa doi
te sach » toc sach
he nam » ha nam, nghe nam
y lang » o lang, _ lang, tay lang

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

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