Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hieu van » hieu va, thien van, lieu va
toc sach » hoc sach, doc sach, thuoc sach
ban hanh » ban hang
nang mai » nang ma, nang tai, lang mai
cham hoc » cham soc, chat hoc, cham hoi
hanh ve » hanh vi, hanh va, hanh kem
hoc ban » hoc bang, hoc dan, hoc bai
hieu ve » hieu va
mai hoi » mai khoi, dai hoi, lai hoi
ve cua » le cua, de cua, te 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) OR (hieu van)) cham hoc ban hanh ve 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) OR (hieu van)) cham hoc ban hanh ve 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) OR (hieu van)) cham hoc ban hanh ve cua triet".
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (toc sach)) ky nang mai hoi. ((hieu ve) OR (hieu van)) cham hoc ban hanh ve cua triet*.