Perhaps you should try some spelling variations:
doanh than » doanh thanh, doanh nhan, doanh phan
ve triet » va trien, su triet
van chat » cao chat
hieu van » hieu va, thien van, lieu va
mai khoi » mai khoa, tai khoa, cac khoi
nang mai » nang ma, nang tai, lang mai
te sach » toc sach
than ve » thanh ve, than va, toan ve
tu sach » thu sach, su sach, tu cach
ac va » tac va, bac va, mac va

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 (te sach)) ky nang mai khoi. hieu van chat ((ac va) or (duc va)) doanh than ve triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (te sach)) ky nang mai khoi. hieu van chat ((ac va) OR (duc va)) doanh than ve triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (te sach)) ky nang mai khoi. hieu van chat ((ac va) or (duc va)) doanh than ve triet".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (te sach)) ky nang mai khoi. hieu van chat ((ac va) or (duc va)) doanh than ve triet*.