Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
hanh vai » hanh vi, hanh va, hanh tai
vai cau » va cau, van cau, vai cac
su sach » so sach, vu sach
hieu ve » hieu va, hieu van
ty hang » ly hang, thi hang, thu hang
xuc va » duc va, luc va, xac va
tuc va » thuc va, truc va, tuc xa
ve cam » ve cham, ve cac, va cam

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ((ty hang) or (ty xang)) co hoc. hieu ve cam ((xuc va) OR (tuc va)) hanh vai cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((ty hang) OR (ty xang)) co hoc. hieu ve cam ((xuc va) OR (tuc va)) hanh vai cau tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((ty hang) or (ty xang)) co hoc. hieu ve cam ((xuc va) OR (tuc va)) hanh vai cau tren".
• Adding a wildcard symbol may retrieve word variants: su sach ((ty hang) or (ty xang)) co hoc. hieu ve cam ((xuc va) OR (tuc va)) hanh vai cau tren*.