Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
thu sach » thuat sach, thuoc sach, thu hoach
danh sai » dung sai, danh bat, danh dau
sai cua » dai cua, hai cua, lai cua
thu xac » thau xay
tu sach » su sach, te sach, tu cach
nang ma » tang ma, sang ma, nang cao
hieu he » hieu ve, hiem he, hieu le
he nam » ha nam, nghe nam
thu xa » thu ha, thu xe, thu ba
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) OR (thu sach)) ky nang ma hoi. hieu he nam ((thu xa) or (thu xac)) danh sai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) ky nang ma hoi. hieu he nam ((thu xa) OR (thu xac)) danh sai cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (thu sach)) ky nang ma hoi. hieu he nam ((thu xa) or (thu xac)) danh sai cua triet".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (thu sach)) ky nang ma hoi. hieu he nam ((thu xa) or (thu xac)) danh sai cua triet*.