Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
quan che » quan he, han che, quan ha
toc sach » hoc sach, doc sach, thuoc sach
van nang » van quang, van ban, van dong
qua chet » quan chet, qua nhat, qua cham
duoc va » nuoc va, duc va, duoc ma
nang xa » nang x, lang xa, nang ma
va dan » ca dan, va dao, va dau
dan vi » doan vi, don vi, dan va
vi su » va su, ve su, ki su

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((te sach) OR (toc sach)) van nang xa hoi. hieu ((qua chet) or (quan che)) duoc va dan vi su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) van nang xa hoi. hieu ((qua chet) OR (quan che)) duoc va dan vi su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) OR (toc sach)) van nang xa hoi. hieu ((qua chet) or (quan che)) duoc va dan vi su triet".
• Adding a wildcard symbol may retrieve word variants: ((te sach) OR (toc sach)) van nang xa hoi. hieu ((qua chet) or (quan che)) duoc va dan vi su triet*.