Perhaps you should try some spelling variations:
chua triet » cua triet, chua thiet, chua trieu
va thanh » gia thanh, ban thanh, va tinh
hieu van » hieu va, thien van, lieu va
va chua » vua chua, ca chua, va chu
va hanh » van hanh, va danh, ban hanh
tu sach » thu sach, su sach, te sach
ky tang » ky nang, ky dang, kho tang
ky lang » ky nang, ky dang, tay lang
van am » van nam, van lam, van dam

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 lang) OR (ky tang)) xa hoi. hieu van am thuc ((va hanh) or (va thanh)) va chua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((ky lang) OR (ky tang)) xa hoi. hieu van am thuc ((va hanh) OR (va thanh)) va chua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((ky lang) OR (ky tang)) xa hoi. hieu van am thuc ((va hanh) or (va thanh)) va chua triet".
• Adding a wildcard symbol may retrieve word variants: tu sach ((ky lang) OR (ky tang)) xa hoi. hieu van am thuc ((va hanh) or (va thanh)) va chua triet*.