Perhaps you should try some spelling variations:
thanh tai » thanh hai, thanh toan, doanh tai
thanh vai » thanh hai, thanh van, thanh oai
va triet » va thiet, va trien, ve triet
hieu van » hieu va, thien van, lieu va
cam qua » cau qua, cac qua, cay qua
qua ban » cua ban, qua quan
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
mai hoi » mai khoi, dai hoi, lai hoi
van cam » van nam, van lam, van cau
ma hoi » xa hoi, ma hoa, me hoi

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 ((ma hoi) OR (mai hoi)). hieu van cam qua ban ((thanh vai) or (thanh tai)) va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang ((ma hoi) OR (mai hoi)). hieu van cam qua ban ((thanh vai) OR (thanh tai)) va triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang ((ma hoi) OR (mai hoi)). hieu van cam qua ban ((thanh vai) or (thanh tai)) va triet".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang ((ma hoi) OR (mai hoi)). hieu van cam qua ban ((thanh vai) or (thanh tai)) va triet*.