Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
hieu hien » bieu hien, dieu hien, chieu chien
hien cac » thien cac, vien cac, hieu cac
va thanh » gia thanh, va tinh, le thanh
doc sach » hoc sach, toc sach, nuoc sach
vai cua » dai cua, hai cua, lai cua
tu sach » thu sach, su sach, te sach
nang xa » nang x, lang xa, nang ma
cac lo » cac lop, cac co, cac bo
cua tu » cua tuc, cua su, cua cu

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) or (doc sach)) ky nang xa hoi. hieu hien cac lo ((va thanh) OR (ban thanh)) vai cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (doc sach)) ky nang xa hoi. hieu hien cac lo ((va thanh) OR (ban thanh)) vai cua tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (doc sach)) ky nang xa hoi. hieu hien cac lo ((va thanh) OR (ban thanh)) vai cua tu".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (doc sach)) ky nang xa hoi. hieu hien cac lo ((va thanh) OR (ban thanh)) vai cua tu*.