Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
nhan duc » nhan duoc, nhan luc, phan duc
thanh vi » hanh vi, thanh va, thanh ve
su triet » su viet, su tien, ve triet
tu sach » thu sach, su sach, te sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
hieu va » hieu qua
duc van » duc va, duc tan, duc manh
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: tu sach ky nang xa hoi. ((hieu va) or (lieu va)) nhan duc van thanh vi su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang xa hoi. ((hieu va) OR (lieu va)) nhan duc van thanh vi su triet.
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang xa hoi. ((hieu va) or (lieu va)) nhan duc van thanh vi su triet*.