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