Perhaps you should try some spelling variations:
lang van » dang van, tang van, hoang van
tinh te » kinh te, tinh tu, tinh he
xuc may » xuc hay, truc may, phuc may
viec va » vien va, viec cua
sach ky » sac ky, sach y, sach ty
te sach » toc sach
lang xa » lang ha, dang xay
cua tre » cua te, cuu tre, cua triet
te cua » tue cua, le cua, de cua

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 ky ((lang xa) or (lang van)) hoi. hieu ((viec lam) OR (viec va)) xuc may tinh te cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky ((lang xa) OR (lang van)) hoi. hieu ((viec lam) OR (viec va)) xuc may tinh te cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky ((lang xa) or (lang van)) hoi. hieu ((viec lam) OR (viec va)) xuc may tinh te cua tre".
• Adding a wildcard symbol may retrieve word variants: te sach ky ((lang xa) or (lang van)) hoi. hieu ((viec lam) OR (viec va)) xuc may tinh te cua tre*.