Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
dua tren » dung tren
van hanh » van thanh, ban hanh, van anh
toc sach » hoc sach, doc sach, thuoc sach
bac hoi » bac ho, bac hoc, sach hoi
hieu va » lieu va, hieu qua
sach tu » sach thu, cach tu, sach ty
dan bac » dan ba, van bac, dong bac
hanh va » hang va, hanh vi
tu dan » tuc dan, tu ban, cu dan
co tuc » co thuc, co toc, do tuc

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach tu dan bac hoi. hieu va ((co tuc) or (co tu)) van hanh va ((dua tren) or (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach tu dan bac hoi. hieu va ((co tuc) OR (co tu)) van hanh va ((dua tren) OR (cua triet)).
• Adding a wildcard symbol may retrieve word variants: toc sach tu dan bac hoi. hieu va ((co tuc) or (co tu)) van hanh va ((dua tren) or (cua triet))*.