Perhaps you should try some spelling variations:
doc sach » hoc sach, toc sach, nuoc sach
sach thu » sach thue, sach thieu, sach tham
hanh vai » hanh vi, hanh va, hanh tai
cau tren » cu tren, dau tren, ca tren
thu nang » thi nang, thu hang, thu bang
hieu va » lieu va, hieu qua
nang xa » nang x, lang xa, nang ma
truc va » thuc va, thuc vat, trung va
cuu tre » cua tre, cau treo
va cam » va cham, va cac, va cao
tuc va » thuc va, tuc xa, duc va

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

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