Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
van hanh » ban hanh, van anh, van ban
vu sach » vu bach, su sach, vu khach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
cao suc » cao su, cao duc
va cao » va cac, va co, va dao
vi va » vi van, vai va, vu va
thiet » thieu

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 ty nang x ho. lieu va cao suc ((gia thanh) or (((van hanh) OR (van thanh)))) vi va thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ty nang x ho. lieu va cao suc ((gia thanh) OR (((van hanh) OR (van thanh)))) vi va thiet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ty nang x ho. lieu va cao suc ((gia thanh) or (((van hanh) OR (van thanh)))) vi va thiet".
• Adding a wildcard symbol may retrieve word variants: vu sach ty nang x ho. lieu va cao suc ((gia thanh) or (((van hanh) OR (van thanh)))) vi va thiet*.