Perhaps you should try some spelling variations:
doc sach » hoc sach, nuoc sach, dac sac
cham loc » cham soc, chon loc, cham o
cau treo » cau theo, cau tren, cau triet
toc sach » hoc sach, thuoc sach, nuoc sach
nang ma » tang ma, sang ma, nang cao
hieu su » hieu sau, tieu su, hieu so
va danh » va dinh, va dan, va hanh
danh di » danh du, xanh di, danh dien
v nang » va nang, vu nang, van nang
ma hoi » mai hoi, xa hoi, ma hoa
loc va » hoc va, luc va
di cau » da cau, diem cau

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((doc sach) OR (toc sach)) v nang ma hoi. ((lieu va) or (hieu su)) cham loc va danh di cau treo~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((doc sach) OR (toc sach)) v nang ma hoi. ((lieu va) OR (hieu su)) cham loc va danh di cau treo.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((doc sach) OR (toc sach)) v nang ma hoi. ((lieu va) or (hieu su)) cham loc va danh di cau treo".
• Adding a wildcard symbol may retrieve word variants: ((doc sach) OR (toc sach)) v nang ma hoi. ((lieu va) or (hieu su)) cham loc va danh di cau treo*.