Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
sach tru » sach truc, sach thu, sach tu
tru nang » tra nang, tri nang, truc nano
cam chan » cam nhan, dan chan
chan ban » can ban, chat ban, chan nan
su sach » so sach, vu sach
hieu va » lieu va, hieu qua
ban anh » ban hanh, ban banh, ban danh
cua tre » cua te, cuu tre, dua tren
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: su sach tru nang ((xa hoi) or (x ho)). hieu va cam chan ban anh d ((cua tre) or (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach tru nang ((xa hoi) OR (x ho)). hieu va cam chan ban anh d ((cua tre) OR (cua triet)).
• Adding a wildcard symbol may retrieve word variants: su sach tru nang ((xa hoi) or (x ho)). hieu va cam chan ban anh d ((cua tre) or (cua triet))*.