Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
hanh lai » hanh lam, thanh lap, thanh loi
hanh tai » thanh tai, hang tai, han tai
tu sach » thu sach, su sach, te sach
mai hoi » mai khoi, dai hoi, lai hoi
hieu ve » hieu va, hieu van
ve pham » vi pham, v pham, ve phan
y nang » ly nang, v nang, may nang

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 ((y nang) OR (ky nang)) mai hoi. hieu ve pham duc va ((hanh lai) or (hanh tai)) cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((y nang) OR (ky nang)) mai hoi. hieu ve pham duc va ((hanh lai) OR (hanh tai)) cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((y nang) OR (ky nang)) mai hoi. hieu ve pham duc va ((hanh lai) or (hanh tai)) cua triet".
• Adding a wildcard symbol may retrieve word variants: tu sach ((y nang) OR (ky nang)) mai hoi. hieu ve pham duc va ((hanh lai) or (hanh tai)) cua triet*.