Perhaps you should try some spelling variations:
dung dai » duong dai, dung tai, dung dat
vu sach » vu bach, su sach, vu khach
ky lang » ky nang, ky tang, tay lang
ky dang » ky nang, ky danh
van hoi » van hoa, van hoc, van hoe
hieu va » lieu va, hieu qua
va cam » va cham, va cac, va cao
xuc va » tuc va, luc va, xac va
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: vu sach ((ky lang) or (ky dang)) van hoi. hieu va cam ((xuc va) OR (duc va)) dung dai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ((ky lang) OR (ky dang)) van hoi. hieu va cam ((xuc va) OR (duc va)) dung dai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ((ky lang) or (ky dang)) van hoi. hieu va cam ((xuc va) OR (duc va)) dung dai cua te".
• Adding a wildcard symbol may retrieve word variants: vu sach ((ky lang) or (ky dang)) van hoi. hieu va cam ((xuc va) OR (duc va)) dung dai cua te*.