Perhaps you should try some spelling variations:
toc sach » hoc sach, thuoc sach, nuoc sach
doc sach » hoc sach, nuoc sach, dac sac
tru nang » tra nang, tri nang, truc nano
danh vai » danh sai, doanh van, dang van
danh va » doanh va, hanh va, anh va
cac suc » cao suc, cac nuoc, cac cuoc
qua cac » cua cac
nang xa » nang x, lang xa, nang ma
suc va » duc va, tuc va, luc va
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) or (doc sach)) tru nang xa hoi. hieu qua cac suc va ((danh vai) OR (danh va)) cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sach) OR (doc sach)) tru nang xa hoi. hieu qua cac suc va ((danh vai) OR (danh va)) cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((toc sach) or (doc sach)) tru nang xa hoi. hieu qua cac suc va ((danh vai) OR (danh va)) cua te".
• Adding a wildcard symbol may retrieve word variants: ((toc sach) or (doc sach)) tru nang xa hoi. hieu qua cac suc va ((danh vai) OR (danh va)) cua te*.