Perhaps you should try some spelling variations:
thanh van » thanh san, thanh toan, thanh phan
thanh dat » thanh san, thanh hai, thanh ha
doc sach » hoc sach, toc sach, nuoc sach
sach thi » sach thu, sach tai, sach thieu
su triet » su viet, su tien, ve triet
thi hanh » thi thanh
hieu va » lieu va, hieu qua
cac tuc » cac tu, cac tac, cac nuoc
cac toc » cac toi, cac nuoc, cac thoi
hanh ca » hanh cac, hanh cat, hanh cua
ca hoi » cau hoi, cua hoi, xa hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: doc sach thi hanh ca hoi. hieu va ((cac tuc) or (cac toc)) xa ((thanh dat) OR (thanh van)) su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc sach thi hanh ca hoi. hieu va ((cac tuc) OR (cac toc)) xa ((thanh dat) OR (thanh van)) su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc sach thi hanh ca hoi. hieu va ((cac tuc) or (cac toc)) xa ((thanh dat) OR (thanh van)) su triet".
• Adding a wildcard symbol may retrieve word variants: doc sach thi hanh ca hoi. hieu va ((cac tuc) or (cac toc)) xa ((thanh dat) OR (thanh van)) su triet*.