Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
hieu van » hieu va, thien van, lieu va
hanh ve » hanh vi, hanh va, hanh kem
va hanh » van hanh, va thanh, va danh
cac bac » cac bai, cac ban, cac cach
su sach » vu sach
so sach » so sanh, bo sach, co sach
cao hoi » cau hoi, co hoi, cao hoc
cac tac » cac toc, cac dac, cac tai
y nang » ky nang, ly nang, v nang
ve su » va su

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)) y nang cao hoi. hieu van ((cac tac) or (cac bac)) va hanh ve su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (so sach)) y nang cao hoi. hieu van ((cac tac) OR (cac bac)) va hanh ve su triet.
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (so sach)) y nang cao hoi. hieu van ((cac tac) or (cac bac)) va hanh ve su triet*.