Perhaps you should try some spelling variations:
dat thanh » dao thanh, dat khanh, dang thanh
thanh tai » thanh hai, thanh toan, doanh tai
cua triet » cua viet, su triet, va triet
so sach » so sanh, bo sach, co sach
ty nang » ty xang, ty hang, ly nang
mai hoi » mai khoi, dai hoi, lai hoi
luc dat » luc bat, luc dai, luc nhat
tai cua » thai cua, tai cuc, tri cua
va cam » va cham, va cao, va cai

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: so sach ((ty nang) OR (ky nang)) mai hoi. lieu ((va cam) or (va cac)) luc dat thanh tai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ((ty nang) OR (ky nang)) mai hoi. lieu ((va cam) OR (va cac)) luc dat thanh tai cua triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ((ty nang) OR (ky nang)) mai hoi. lieu ((va cam) or (va cac)) luc dat thanh tai cua triet".
• Adding a wildcard symbol may retrieve word variants: so sach ((ty nang) OR (ky nang)) mai hoi. lieu ((va cam) or (va cac)) luc dat thanh tai cua triet*.