Perhaps you should try some spelling variations:
bang hanh » bang thanh, ban hanh, bang hinh
cua triet » cua viet, su triet, va triet
toc sach » hoc sach, doc sach, thuoc sach
nang mai » nang ma, nang tai, lang mai
cham hoc » cham soc, chat hoc, cham hoi
hoc bang » hoc bong, hoc tang, hoc dan
mai hoi » mai khoi, dai hoi, lai hoi
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
hanh de » hanh ve, hanh kem
de cua » le cua, te cua, dieu cua

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) or (toc sach)) ky nang mai hoi. hieu ve cham hoc bang hanh de cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) ky nang mai hoi. hieu ve cham hoc bang hanh de cua triet.
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (toc sach)) ky nang mai hoi. hieu ve cham hoc bang hanh de cua triet*.