Perhaps you should try some spelling variations:
sach thu » sach thue, sach thieu, sach tham
thu nang » thi nang, thu hang, thu bang
cham tuc » nham thuc, pham thuc, tham thuc
danh sai » dung sai, danh bat, danh dau
cau tren » cu tren, dau tren, ca tren
tu sach » thu sach, su sach, te sach
hieu ve » hieu van
hieu va » lieu va, hieu qua
va danh » va dinh, va dan, va hanh
sai cau » lai chau, mai chau, hai chau
tuc va » thuc va, truc va, tuc xa
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach thu nang x hoi. ((hieu ve) or (hieu va)) cham tuc va danh sai cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach thu nang x hoi. ((hieu ve) OR (hieu va)) cham tuc va danh sai cau tren.
• Adding a wildcard symbol may retrieve word variants: tu sach thu nang x hoi. ((hieu ve) or (hieu va)) cham tuc va danh sai cau tren*.