Perhaps you should try some spelling variations:
nguoi sach » nguoi san, nuoc sach
thuoc sach » hoc sach, nuoc sach, thuat sach
cau tren » cu tren, dau tren, ca tren
vu dang » su dang, vu quang, cua dang
dang xa » dang xay, lang xa, dang ha
hieu va » lieu va, hieu qua
hanh de » hanh ve, hanh kem
luc va » duc va, loc va
tuc va » thuc va, truc va, tuc xa
de cau » ke cau, le cau, ve cau
va cam » va cham, va cac, va cao

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((nguoi sach) or (thuoc sach)) vu dang xa hoi. hieu va cam ((luc va) or (tuc va)) hanh de cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((nguoi sach) OR (thuoc sach)) vu dang xa hoi. hieu va cam ((luc va) OR (tuc va)) hanh de cau tren.
• Adding a wildcard symbol may retrieve word variants: ((nguoi sach) or (thuoc sach)) vu dang xa hoi. hieu va cam ((luc va) or (tuc va)) hanh de cau tren*.