Perhaps you should try some spelling variations:
cuc triet » cua triet, su triet, cac trieu
bach tuoc » sach duoc, sach nuoc
hanh tai » thanh tai, hang tai, han tai
bac tuc » bac tu, bac thua
va hanh » van hanh, va thanh, va danh
su sach » vu sach
hieu va » lieu va, hieu qua
nang xa » nang x, lang xa, nang ma
so sach » so sanh, bo sach, co sach

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((su sach) or (so sach)) ky nang xa hoi. hieu va ((bac tuc) or (bach tuoc)) va hanh tai cuc triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (so sach)) ky nang xa hoi. hieu va ((bac tuc) OR (bach tuoc)) va hanh tai cuc triet.
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (so sach)) ky nang xa hoi. hieu va ((bac tuc) or (bach tuoc)) va hanh tai cuc triet*.