Perhaps you should try some spelling variations:
thanh vai » thanh hai, thanh van, thanh oai
thanh tai » thanh hai, thanh toan, doanh tai
cua triet » cua viet, su triet, va triet
hieu van » hieu va, thien van, lieu va
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
cao hoi » cau hoi, co hoi, cao hoc
van cay » van cau, van bay, van ca
cay qua » cau qua, cac qua, cay lua

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 ky nang cao hoi. hieu van cay qua quan ((thanh vai) or (thanh tai)) cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang cao hoi. hieu van cay qua quan ((thanh vai) OR (thanh tai)) cua triet.
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang cao hoi. hieu van cay qua quan ((thanh vai) or (thanh tai)) cua triet*.