Perhaps you should try some spelling variations:
chau triet » cau triet, cua triet, cau trieu
thanh hoa » thanh pho
hanh lai » hanh lam, hanh tai, thanh lap
hoc duc » hoc duoc, hoc nuoc, hoc thuc
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
hac duc » ha duc, thach duc, pham duc
nang o » nang co, nang ho, nang ro
o hai » co hai, so hai, o lai

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 nang o hai. lieu va ((hac duc) OR (hoc duc)) va ((hanh lai) or (thanh hoa)) chau triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang o hai. lieu va ((hac duc) OR (hoc duc)) va ((hanh lai) OR (thanh hoa)) chau triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ky nang o hai. lieu va ((hac duc) OR (hoc duc)) va ((hanh lai) or (thanh hoa)) chau triet".
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang o hai. lieu va ((hac duc) OR (hoc duc)) va ((hanh lai) or (thanh hoa)) chau triet*.