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 » so sach
hieu va » lieu va, hieu qua
nang xa » nang x, lang xa, nang ma
vu sach » vu bach, vu khach
y nang » ky nang, ly nang, v nang

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 (vu sach)) y 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 (vu sach)) y nang xa hoi. hieu va ((bac tuc) OR (bach tuoc)) va hanh tai cuc triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) OR (vu sach)) y 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 (vu sach)) y nang xa hoi. hieu va ((bac tuc) or (bach tuoc)) va hanh tai cuc triet*.