Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
cau tren » cu tren, dau tren, ca tren
sach ky » sac ky, sach y, sach ty
lang xa » dang xay, lang van
lang ha » long ha
hieu ve » hieu va, hieu van
xuc van » luc van, xuc ban, thuc van
duc van » duc va, duc tan, duc manh
ve cam » ve cham, ve cac, va cam
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 ky ((lang xa) OR (lang ha)) hoi. hieu ve cam ((xuc van) or (duc van)) hanh vi cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky ((lang xa) OR (lang ha)) hoi. hieu ve cam ((xuc van) OR (duc van)) hanh vi cau tren*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky ((lang xa) OR (lang ha)) hoi. hieu ve cam ((xuc van) or (duc van)) hanh vi cau tren*".