Perhaps you should try some spelling variations:
sach thu » sach thue, sach thieu, sach tham
thu nang » thi nang, thu hang, thu bang
te sach » toc sach
doi cua » dai cua, hoi cua
va hanh » van hanh, va thanh, va danh
thuc va » thuc vat, thuc dan, thuc day
nang xa » nang x, lang xa, nang ma
ve cam » ve cham, va cam, ve cai
di cua » dai cua, de cua, do cua
ve cac » va cac, vien cac

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 xa hoi. hieu ((ve cam) or (ve cac)) thuc va hanh ((di cua) OR (doi cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach thu nang xa hoi. hieu ((ve cam) OR (ve cac)) thuc va hanh ((di cua) OR (doi cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach thu nang xa hoi. hieu ((ve cam) or (ve cac)) thuc va hanh ((di cua) OR (doi cua)) tre".
• Adding a wildcard symbol may retrieve word variants: te sach thu nang xa hoi. hieu ((ve cam) or (ve cac)) thuc va hanh ((di cua) OR (doi cua)) tre*.