Perhaps you should try some spelling variations:
thien van » thi van
nang mai » nang ma, nang tai, lang mai
cau phuc » cau truc, chau phu, huu phuc
ve triet » va trien, su triet
su sach » so sach, vu sach
co sach » bo sach, cuon sach, hoc sach
mai hoi » mai khoi, dai hoi, lai hoi
van cau » van dau, van hau, van chat
phuc va » phuc vu, thuc va, chuc va
va danh » va dinh, va dan, va hanh
danh vi » hanh vi, dinh vi, danh di
y nang » ky nang, ly nang, v nang
vi ve » va ve, gi ve, ve ve

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 (co sach)) y nang mai hoi. thien van cau phuc va danh vi ve triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (co sach)) y nang mai hoi. thien van cau phuc va danh vi ve triet.
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (co sach)) y nang mai hoi. thien van cau phuc va danh vi ve triet*.