Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
vu sach » vu bach, su sach, vu khach
so sach » so sanh, bo sach, co sach
nang ma » tang ma, sang ma, nang cao
cac tac » cac toc, cac dac, cac tai
cac bac » cac bai, cac ban, cac cach
va hanh » van hanh, va thanh, va danh
y nang » ky nang, ly nang, v nang
ma hoi » mai hoi, xa hoi, ma hoa
vi su » va su, ve su, ki su

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((vu sach) or (so sach)) y nang ma hoi. lieu va ((cac tac) or (cac bac)) va hanh vi su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu sach) OR (so sach)) y nang ma hoi. lieu va ((cac tac) OR (cac bac)) va hanh vi su triet.
• Adding a wildcard symbol may retrieve word variants: ((vu sach) or (so sach)) y nang ma hoi. lieu va ((cac tac) or (cac bac)) va hanh vi su triet*.