Perhaps you should try some spelling variations:
van nang » van quang, van ban, van dong
qua cham » qua hai, qua cac, va cham
dung dai » duong dai, dung tai, dung dat
su sach » so sach, vu sach
vu nang » vuc nang, va nang, vu dang
qua cam » qua cac, qua ca, qua cai
va dung » van dung, va duong, vat dung
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 ((van nang) or (vu nang)) xa hoi. hieu ((qua cam) OR (qua cham)) duc va dung dai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((van nang) OR (vu nang)) xa hoi. hieu ((qua cam) OR (qua cham)) duc va dung dai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((van nang) or (vu nang)) xa hoi. hieu ((qua cam) OR (qua cham)) duc va dung dai cua te".
• Adding a wildcard symbol may retrieve word variants: su sach ((van nang) or (vu nang)) xa hoi. hieu ((qua cam) OR (qua cham)) duc va dung dai cua te*.