Perhaps you should try some spelling variations:
sach thu » sach thue, sach thieu, sach tham
thu nang » thi nang, thu hang, thu bang
cham cuu » cap cuu, chat cua
thai cua » than cua, tai cuc, tri cua
te sach » toc sach
hieu va » lieu va, hieu qua
va cham » va chat, va tham
tai cua » tai cuc, tri cua, dai cua
cuu va » cuu van, cuu ve
va han » va phan, van han, va hanh
x hoi » xa hoi, o hoi, 5 hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach thu nang ((x hoi) or (x ho)). hieu va cham cuu va han ((tai cua) OR (thai cua)) tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach thu nang ((x hoi) OR (x ho)). hieu va cham cuu va han ((tai cua) OR (thai cua)) tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach thu nang ((x hoi) or (x ho)). hieu va cham cuu va han ((tai cua) OR (thai cua)) tu".
• Adding a wildcard symbol may retrieve word variants: te sach thu nang ((x hoi) or (x ho)). hieu va cham cuu va han ((tai cua) OR (thai cua)) tu*.