Perhaps you should try some spelling variations:
thien van » thi van
hanh gian » thanh gian, thanh giang, manh giang
gian hoa » gian ha, gian hoi, gian thua
thu nang » thi nang, thu hang, thu bang
sach thu » sach thue, sach thieu, sach tham
va hanh » van hanh, va thanh, va danh
thuc va » thuc vat, thuc dan, thuc day
te sach » toc sach
hieu ve » hieu va, hieu van
o hoi » co hoi, o hoc, o hai

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 ((o hoi) OR (xa hoi)). ((hieu ve) OR (thien van)) am thuc va hanh gian hoa viet~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach thu nang ((o hoi) OR (xa hoi)). ((hieu ve) OR (thien van)) am thuc va hanh gian hoa viet".
• Adding a wildcard symbol may retrieve word variants: te sach thu nang ((o hoi) OR (xa hoi)). ((hieu ve) OR (thien van)) am thuc va hanh gian hoa viet*.