Perhaps you should try some spelling variations:
thien nang » thien bang, thien dang, trien nang
tu sach » thu sach, te sach, tu cach
hanh va » hang va, hanh vi
va hanh » van hanh, va thanh, va danh
hieu va » lieu va, hieu qua
cac tuc » cac toc, cac tu, cac tac
nang xa » nang x, lang xa, nang ma
su sach » so sach, vu sach
ca tren » cau tren, cu tren, la tren
tuc va » thuc va, truc va, tuc xa
cua te » cua tu

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

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