Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
cham hoi » cham voi, cham h'roi, pham hoai
nang mai » nang ma, nang tai, lang mai
ban hanh » ban hang
cham hoc » cham soc, chat hoc, cho hoc
cua tre » cua te, cuu tre, dua tren
hanh va » hang va, hanh vi
te sach » toc sach
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
mai hoi » mai khoi, dai hoi, lai hoi

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 ky nang mai hoi. hieu ve ((cham hoc) or (cham hoi)) ban hanh va ((cua tre) OR (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky nang mai hoi. hieu ve ((cham hoc) OR (cham hoi)) ban hanh va ((cua tre) OR (cua triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky nang mai hoi. hieu ve ((cham hoc) or (cham hoi)) ban hanh va ((cua tre) OR (cua triet))".
• Adding a wildcard symbol may retrieve word variants: te sach ky nang mai hoi. hieu ve ((cham hoc) or (cham hoi)) ban hanh va ((cua tre) OR (cua triet))*.