Perhaps you should try some spelling variations:
thanh ban » thanh san, thanh van, thanh bac
anh thanh » danh thanh, nhanh thanh, thanh thanh
su sach » so sach
cac duc » cao duc, cac dac, cac nuoc
hieu ve » hieu va, hieu van
nang xa » nang x, lang xa, nang ma
ty nang » ky nang, ty xang, ty hang
vu sach » vu bach, vu khach
ban cua » ban quan

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 (vu sach)) ty nang xa hoi. hieu ve ((cac duc) OR (cac du)) anh thanh ban cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (vu sach)) ty nang xa hoi. hieu ve ((cac duc) OR (cac du)) anh thanh ban cua vat.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (vu sach)) ty nang xa hoi. hieu ve ((cac duc) OR (cac du)) anh thanh ban cua vat".
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (vu sach)) ty nang xa hoi. hieu ve ((cac duc) OR (cac du)) anh thanh ban cua vat*.