Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
dua tren » dung tren
sach ly » sach y, sach lo, sach ty
ly vang » ly hang, ly van, ly quang
hieu va » lieu va, hieu qua
lam loc » lam duoc, lam ngoc
va danh » va dinh, va dan, va hanh
danh du » danh dau, danh tu, dinh du
ma hoi » mai hoi, ma hoa, me hoi
va lam » van lam, va lap
loc va » hoc va, luc va
du dua » de dua, du dia, duc duat

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 ly vang ((ma hoi) or (xa hoi)). hieu va lam loc va danh du dua tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ly vang ((ma hoi) OR (xa hoi)). hieu va lam loc va danh du dua tren.
• Adding a wildcard symbol may retrieve word variants: thu sach ly vang ((ma hoi) or (xa hoi)). hieu va lam loc va danh du dua tren*.