Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
doanh va » doan va, doanh tai, doanh cua
truc va » thuc va, thuc vat, trung va
van bac » van ban, van hac, dan bac
van bao » van ban, van dao
nang xa » nang x, lang xa, nang ma
y nang » ky nang, ly nang, v nang
tuc va » thuc va, tuc xa, duc va
va cua » va chua, via cua, ca cua
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: toc sach y nang xa hoi. hieu ((van bac) or (van bao)) ((tuc va) OR (truc va)) doanh va cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach y nang xa hoi. hieu ((van bac) OR (van bao)) ((tuc va) OR (truc va)) doanh va cua te*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach y nang xa hoi. hieu ((van bac) or (van bao)) ((tuc va) OR (truc va)) doanh va cua te*".