Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
thanh van » thanh toan, thanh phan, thanh nhan
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
nang ma » tang ma, sang ma, nang cao
van bac » van bao, van hac, dan bac
ma hoi » mai hoi, xa hoi, ma hoa

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 ty nang ma hoi. hieu ((van bac) or (van ban)) day va ((thanh van) or (thanh san)) cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang ma hoi. hieu ((van bac) OR (van ban)) day va ((thanh van) OR (thanh san)) cua triet.
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang ma hoi. hieu ((van bac) or (van ban)) day va ((thanh van) or (thanh san)) cua triet*.