Perhaps you should try some spelling variations:
chau triet » cau triet, cua triet, cau trieu
hieu van » hieu va, thien van, lieu va
hanh lai » hanh lam, hanh tai, thanh lap
tu sach » thu sach, su sach, te sach
cao hoi » cau hoi, co hoi, cao hoc
duc van » duc tan, duc manh, duc 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)) cao hoi. hieu van nam ((duc van) or (duc va)) hanh lai chau triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((y nang) OR (ky nang)) cao hoi. hieu van nam ((duc van) OR (duc va)) hanh lai chau triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((y nang) OR (ky nang)) cao hoi. hieu van nam ((duc van) or (duc va)) hanh lai chau triet".
• Adding a wildcard symbol may retrieve word variants: tu sach ((y nang) OR (ky nang)) cao hoi. hieu van nam ((duc van) or (duc va)) hanh lai chau triet*.