Perhaps you should try some spelling variations:
phap thuc » phap thu, phap hoc
thu chang » thu hang, thu thang, thi chang
cua triet » cua viet, su triet, va triet
sach thu » sach thue, sach thieu, sach tham
chang xu » chang xue, chao xu, thong xu
hieu van » hieu va, thien van, lieu va
van hanh » van thanh, ban hanh, van anh
hanh vai » hanh vi, hanh va, hanh tai
so sach » so sanh, bo sach, co sach
phap tu » phan tu, pham tu
vai cua » dai cua, hai cua, lai cua
xu hoi » xa hoi, lu hoi, vu hoi

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 thu chang xu hoi. hieu van ((phap thuc) or (phap tu)) van hanh vai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach thu chang xu hoi. hieu van ((phap thuc) OR (phap tu)) van hanh vai cua triet.
• Adding a wildcard symbol may retrieve word variants: so sach thu chang xu hoi. hieu van ((phap thuc) or (phap tu)) van hanh vai cua triet*.