Perhaps you should try some spelling variations:
cac thuat » va thuat, hoc thuat, cac chat
doanh van » doan van, doanh va, doanh ban
thien van » thi van
va doanh » van doanh, vay doanh, va danh
van cua » vang cua, ban cua, dan cua
cac thu » cach thuc, cac thoi
te sach » toc sach
lang xa » lang ha, dang xay, lang van
nang xa » nang x, nang ma, mang xa
cua tre » cua te, cuu tre, cua triet

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