Perhaps you should try some spelling variations:
thanh phan » thanh pho, thanh san, thanh toan
cua triet » cua viet, su triet, va triet
dua tren » dung tren
hieu van » hieu va, thien van, lieu va
so sach » so sanh, bo sach, co sach
sach ky » sac ky, sach y, sach ty
van cac » van hac, van cau, van bac
nang ma » tang ma, sang ma, nang cao
ma hoi » mai hoi, xa hoi, ma hoa
tuc va » thuc va, truc va, duc va

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach ky nang ma hoi. hieu van cac ((tuc va) or (tuc xa)) thanh phan ((dua tren) or (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ky nang ma hoi. hieu van cac ((tuc va) OR (tuc xa)) thanh phan ((dua tren) OR (cua triet)).
• Adding a wildcard symbol may retrieve word variants: so sach ky nang ma hoi. hieu van cac ((tuc va) or (tuc xa)) thanh phan ((dua tren) or (cua triet))*.