Perhaps you should try some spelling variations:
nhien cac » hien cac, thien cac, vien cac
vat hanh » vat thanh, van hanh, va hanh
su triet » su viet, su tien, ve triet
su sach » so sach, vu sach
ty nang » ty xang, ty hang, ly nang
cac hoc » cach hoc, cac hop, bac hoc
hoc vat » hoc va, hoc viet, thuc vat
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: su sach ((ty nang) or (ky nang)) xa hoi. thien nhien cac hoc vat hanh vi su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((ty nang) OR (ky nang)) xa hoi. thien nhien cac hoc vat hanh vi su triet.
• Adding a wildcard symbol may retrieve word variants: su sach ((ty nang) or (ky nang)) xa hoi. thien nhien cac hoc vat hanh vi su triet*.