Perhaps you should try some spelling variations:
thanh vai » thanh hai, thanh tai, thanh oai
thanh van » thanh san, thanh toan, thanh phan
cua triet » cua viet, su triet, va triet
vu sach » vu bach, su sach, vu khach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
cac duc » cao duc, cac dac, cac nuoc

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 ky nang xa hoi. hieu va ((cac duc) or (cac du)) ban ((thanh vai) OR (thanh van)) cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ky nang xa hoi. hieu va ((cac duc) OR (cac du)) ban ((thanh vai) OR (thanh van)) cua triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ky nang xa hoi. hieu va ((cac duc) or (cac du)) ban ((thanh vai) OR (thanh van)) cua triet*".