Perhaps you should try some spelling variations:
trong van » trong cac
sach tham » sach nha
cham duc » pham duc, cham soc, pham duy
tang van » dang van, hoang van, tang luan
va thanh » gia thanh, ban thanh, va tinh
so sach » so sanh, bo sach, co sach
vai cua » dai cua, hai cua, lai cua
hieu va » lieu va, hieu qua
va cham » va chat, va tham
vi cua » di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach tham ((tang van) or (trong van)) hoe. hieu va cham duc va thanh ((vi cua) OR (vai cua)) tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach tham ((tang van) OR (trong van)) hoe. hieu va cham duc va thanh ((vi cua) OR (vai cua)) tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach tham ((tang van) or (trong van)) hoe. hieu va cham duc va thanh ((vi cua) OR (vai cua)) tu".
• Adding a wildcard symbol may retrieve word variants: so sach tham ((tang van) or (trong van)) hoe. hieu va cham duc va thanh ((vi cua) OR (vai cua)) tu*.