Perhaps you should try some spelling variations:
thien van » thi van
cac thuat » va thuat, hoc thuat, cac thu
doanh van » doan van, doanh va, doanh ban
thuat va » thuyet va, thuat xay, thuat bai
va doanh » van doanh, vay doanh, va danh
te sach » toc sach
van cac » van hac, van cau, van bac
cua tre » cua te, cua triet, dua tren
cuu tre » cau tren, cau treo
y nang » ly nang, v nang, may nang

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 ((y nang) or (ky nang)) xa hoi. thien van cac thuat va doanh van ((cua tre) OR (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((y nang) OR (ky nang)) xa hoi. thien van cac thuat va doanh van ((cua tre) OR (cuu tre))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((y nang) or (ky nang)) xa hoi. thien van cac thuat va doanh van ((cua tre) OR (cuu tre))*".