Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
thanh tri » thanh tra, thanh tai, chinh tri
tan thanh » tran thanh, tang thanh, toan thanh
nang cho » nang chon, ngang cho, nang cao
hieu van » thien van, lieu va, hieu ve
cam duc » cam xuc, cao duc, pham duc
tu sach » thu sach, te sach, tu cach
cho hoc » co hoc, khoa hoc
ty nang » ky nang, ty xang, ty hang
su sach » so sach, vu sach
hieu va » lieu va, hieu qua

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) OR (su sach)) ty nang cho hoc. ((hieu va) or (hieu van)) cam duc tan thanh tri cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) ty nang cho hoc. ((hieu va) OR (hieu van)) cam duc tan thanh tri cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (su sach)) ty nang cho hoc. ((hieu va) or (hieu van)) cam duc tan thanh tri cua triet".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (su sach)) ty nang cho hoc. ((hieu va) or (hieu van)) cam duc tan thanh tri cua triet*.