Perhaps you should try some spelling variations:
sach thien » sach thieu, sach tien, cach thien
thien nang » thien bang, thien dang, trien nang
thien van » thi van
su sach » so sach, vu sach
cua tre » cuu tre, cua triet, dua tren
va hanh » van hanh, va thanh, va danh
ca tren » cau tren, cu tren, la tren
cam tuc » cam xuc, cam tu, nam thuc
van cam » van nam, van lam, van cau
cua te » cua tu
tuc va » thuc va, truc va, tuc xa
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: su sach thien nang x hoi. thien van cam tuc va hanh vi ((((cua tre) OR (cua te))) or (ca tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach thien nang x hoi. thien van cam tuc va hanh vi ((((cua tre) OR (cua te))) OR (ca tren)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach thien nang x hoi. thien van cam tuc va hanh vi ((((cua tre) OR (cua te))) or (ca tren))".
• Adding a wildcard symbol may retrieve word variants: su sach thien nang x hoi. thien van cam tuc va hanh vi ((((cua tre) OR (cua te))) or (ca tren))*.