Perhaps you should try some spelling variations:
sach thu » sach thue, sach thieu, sach tham
thu nang » thi nang, thu hang, thu bang
thuc day » thuc dan, thuc vat
tu sach » thu sach, su sach, te sach
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
truc va » thuc vat, trung va
thuc va » thuc vat, thuc dan
hanh va » hang va, hanh vi
cau tre » cau tren, cau treo, cau tra
ve cau » ke cau, ve cac, le cau
va cau » van cau, va cac, va dau

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach thu nang xa hoi. hieu ve cau ((truc va) or (((thuc va) OR (thuc day)))) hanh va cau tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach thu nang xa hoi. hieu ve cau ((truc va) OR (((thuc va) OR (thuc day)))) hanh va cau tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach thu nang xa hoi. hieu ve cau ((truc va) or (((thuc va) OR (thuc day)))) hanh va cau tre".
• Adding a wildcard symbol may retrieve word variants: tu sach thu nang xa hoi. hieu ve cau ((truc va) or (((thuc va) OR (thuc day)))) hanh va cau tre*.