Perhaps you should try some spelling variations:
thu sach » thuat sach, thuoc sach, thu hoach
tu sach » su sach, te sach, tu cach
ty hang » ly hang, ty xang, thi hang
hang xa » hoang xa, hang va, hang ca
hieu va » lieu va, hieu qua
xuc va » tuc va, luc va, xac va
vi cau » va cau, ve cau, di cau

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((thu sach) or (tu sach)) ty hang xa hoi. hieu va cac ((xuc va) or (duc va)) hanh vi cau thi~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (tu sach)) ty hang xa hoi. hieu va cac ((xuc va) OR (duc va)) hanh vi cau thi.
• Adding a wildcard symbol may retrieve word variants: ((thu sach) or (tu sach)) ty hang xa hoi. hieu va cac ((xuc va) or (duc va)) hanh vi cau thi*.