Perhaps you should try some spelling variations:
hieu viec » nhieu viec, hieu ve, sieu viet
tinh vai » tinh va, tinh hai, tinh bai
dai lao » dai lan, dai thao, dai luan
vai cua » dai cua, hai cua, lai cua
va tinh » may tinh
te sach » toc sach
ky dang » ky nang, ky danh
ty dang » ty xang, ty hang, ty dong
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: te sach ((ty dang) OR (ky dang)) van hoa. hieu viec ((dai lao) or (dai han)) va tinh vai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((ty dang) OR (ky dang)) van hoa. hieu viec ((dai lao) OR (dai han)) va tinh vai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((ty dang) OR (ky dang)) van hoa. hieu viec ((dai lao) or (dai han)) va tinh vai cua te".
• Adding a wildcard symbol may retrieve word variants: te sach ((ty dang) OR (ky dang)) van hoa. hieu viec ((dai lao) or (dai han)) va tinh vai cua te*.