Perhaps you should try some spelling variations:
doanh dan » doanh ban, doanh van, doanh dao
toc sach » hoc sach, doc sach, thuoc sach
hieu van » hieu va, thien van, lieu va
duong va » duong van, dung va, luong va
sach ky » sac ky, sach y, sach ty
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
van lam » van nam
duoc va » nuoc va, duoc ma, duoc lam
dan cua » dan ca, ban cua, dai cua
cua tre » cua te, cuu tre, cua triet

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach ky lang xa hoi. hieu van lam ((((duoc va) OR (duong va))) or (duc va)) doanh dan cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ky lang xa hoi. hieu van lam ((((duoc va) OR (duong va))) OR (duc va)) doanh dan cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ky lang xa hoi. hieu van lam ((((duoc va) OR (duong va))) or (duc va)) doanh dan cua tre".
• Adding a wildcard symbol may retrieve word variants: toc sach ky lang xa hoi. hieu van lam ((((duoc va) OR (duong va))) or (duc va)) doanh dan cua tre*.