Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
cham hoc » cham soc, chat hoc, cham hoi
nang mai » nang ma, nang tai, lang mai
hoc bang » hoc bong, hoc tang, hoc dan
hang ke » thong ke, hanh kem, nhung ke
hang ve » hang va, hanh ve, hang vi
te sach » toc sach
sach ky » sac ky, sach y, sach ty
hieu va » lieu va, hieu qua
hieu ve » 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) or (hieu va)) cham hoc bang ((hang ve) OR (hang ke)) cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky nang mai hoi. ((hieu ve) OR (hieu va)) cham hoc bang ((hang ve) OR (hang ke)) cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky nang mai hoi. ((hieu ve) or (hieu va)) cham hoc bang ((hang ve) OR (hang ke)) cua triet".
• Adding a wildcard symbol may retrieve word variants: te sach ky nang mai hoi. ((hieu ve) or (hieu va)) cham hoc bang ((hang ve) OR (hang ke)) cua triet*.