Perhaps you should try some spelling variations:
dung dai » duong dai, dung tai, dung dat
su sach » so sach, vu sach
vu nang » vuc nang, va nang, vu dang
va dung » van dung, va duong, vat dung
v nang » va nang, van nang, voi nang
qua ca » qua cac, qua cua, qua cai
ca duc » cao duc, cua duc, ca dua
cua te » cua tu

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 ((v nang) or (vu nang)) xa hoi. hieu qua ca duc va dung dai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((v nang) OR (vu nang)) xa hoi. hieu qua ca duc va dung dai cua te.
• Adding a wildcard symbol may retrieve word variants: su sach ((v nang) or (vu nang)) xa hoi. hieu qua ca duc va dung dai cua te*.