Perhaps you should try some spelling variations:
thien nang » thien bang, thien dang, thien cong
trien nang » trien nong, trien mang, trien quang
tu sach » thu sach, su sach, te sach
hanh va » hang va, hanh vi
va hanh » van hanh, va thanh, va danh
cam tuc » cam xuc, cam tu, nam thuc
ca tren » cau tren, cu tren, la tren
hieu va » lieu va, hieu qua
tuc va » thuc va, truc va, tuc xa
cua te » cua tu
va cam » va cham, va cac, va cao

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