Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
dua tren » dung tren
ban hanh » ban hang
sach ky » sac ky, sach y, sach ty
hanh di » hanh vi, hanh de, hang di
cuc ban » cua ban, cac ban, cuu ban
tu sach » thu sach, su sach, te sach
hieu va » lieu va, hieu qua
hieu ve » hieu van
cam cuc » cam xuc, cham cuu, pham cuc
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 ky nang x hoi. ((hieu ve) or (hieu va)) cam cuc ban hanh di ((dua tren) or (cau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky nang x hoi. ((hieu ve) OR (hieu va)) cam cuc ban hanh di ((dua tren) OR (cau tren)).
• Adding a wildcard symbol may retrieve word variants: tu sach ky nang x hoi. ((hieu ve) or (hieu va)) cam cuc ban hanh di ((dua tren) or (cau tren))*.