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