Perhaps you should try some spelling variations:
van doanh » toan doanh, van dong, van thanh
tru nang » tra nang, tri nang, truc nano
doanh va » doan va, doanh tai, doanh cua
tu sach » thu sach, te sach, tu cach
su sach » so sach, vu sach
nang xa » nang x, lang xa, nang ma
duc van » duc va, duc tan, duc manh
va cua » va chua, via cua, ca cua
ve cao » ve bao, ve cac, ve co
va cao » va cac, va co, va dao
cua te » cua tu

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