Perhaps you should try some spelling variations:
thanh lai » thanh hai, thanh loi, thanh tai
thanh lap » thanh san, phan lap, thanh hai
cua triet » su triet, va triet
cong dau » cong dan, cong cau, cong da
thi cong » tai cong, thien cong
cua viet » ca viet, hoa viet, cua vat
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
ky tang » ky nang, ky dang, kho tang
tang xa » trang xa, tang ma, lang xa

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 tang xa hoi. thi cong dau tu va ((thanh lai) or (thanh lap)) ((cua triet) or (cua viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky tang xa hoi. thi cong dau tu va ((thanh lai) OR (thanh lap)) ((cua triet) OR (cua viet)).
• Adding a wildcard symbol may retrieve word variants: tu sach ky tang xa hoi. thi cong dau tu va ((thanh lai) or (thanh lap)) ((cua triet) or (cua viet))*.