Perhaps you should try some spelling variations:
sach trien » sach tien, sach tren, sach thieu
trien nong » trien cong
dau tren » dau tien, dat tren, dau tieng
va trien » va truyen, va thiet, va tuyen
thanh vi » hanh vi, thanh va, thanh ve
va thanh » gia thanh, ban thanh, va tinh
cam tuc » cam xuc, cam tu, nam thuc
tu sach » thu sach, su sach, te sach
hieu va » hieu qua
tuc va » thuc va, truc va, tuc xa
nong x » nong xa, nang x, nong e
x hoi » xa hoi, o hoi, x ho

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 trien nong x hoi. ((hieu va) or (lieu va)) cam tuc va thanh vi ((va trien) or (dau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach trien nong x hoi. ((hieu va) OR (lieu va)) cam tuc va thanh vi ((va trien) OR (dau tren)).
• Adding a wildcard symbol may retrieve word variants: tu sach trien nong x hoi. ((hieu va) or (lieu va)) cam tuc va thanh vi ((va trien) or (dau tren))*.