Perhaps you should try some spelling variations:
tan hanh » tan thanh, tang hanh, toan hanh
hanh vai » hanh vi, hanh va, hanh tai
su triet » su viet, su tien, ve triet
sach ly » sach lo, sach ty, sach hay
hieu va » lieu va, hieu qua
va pham » van pham, va phat, va phap
cua tre » cua te, cuu tre, cua triet
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((sach ly) OR (sach y)) nang x hoi. hieu va pham duc tan hanh vai ((cua tre) or (su triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ly) OR (sach y)) nang x hoi. hieu va pham duc tan hanh vai ((cua tre) OR (su triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ly) OR (sach y)) nang x hoi. hieu va pham duc tan hanh vai ((cua tre) or (su triet))".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ly) OR (sach y)) nang x hoi. hieu va pham duc tan hanh vai ((cua tre) or (su triet))*.