Perhaps you should try some spelling variations:
thu nang » thi nang, thu hang, thu bang
sach thu » sach thue, sach thieu, sach tham
tuc van » thuc van, truc van, duc van
so sach » so sanh, bo sach, co sach
hieu ve » hieu va, hieu van
nang xa » nang x, lang xa, nang ma
ve cam » ve cham, ve cac, va cam
tuc va » thuc va, truc va, tuc xa
dai va » mai va
di va » di vao, doi va, di vat

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach thu nang xa hoi. hieu ve cam ((tuc van) or (tuc va)) hoang ((di va) OR (dai va)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach thu nang xa hoi. hieu ve cam ((tuc van) OR (tuc va)) hoang ((di va) OR (dai va)) triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach thu nang xa hoi. hieu ve cam ((tuc van) or (tuc va)) hoang ((di va) OR (dai va)) triet*".