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

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 ve) OR (hanh vi)) 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 ve) OR (hanh vi)) cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) or (toc sach)) ky nang mai hoi. hieu ve cham hoc bang ((hanh ve) OR (hanh vi)) 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 ve) OR (hanh vi)) cua triet*.