Perhaps you should try some spelling variations:
lam truc » lam truoc, nam truc, lam thuoc
thanh va » thanh van, hanh va, thanh ha
va thanh » gia thanh, ban thanh, va tinh
hieu van » hieu va, thien van, lieu va
tu sach » thu sach, su sach, te sach
ca viet » va viet, hoa viet, san viet
truc va » thuc va, thuc vat, trung va
van lam » van nam
mang xa » lang xa, mang may, dang xay
xang xa » lang xa, ang xa, dang xay
co viet » so viet, o viet, hoc viet

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach y ((xang xa) or (mang xa)) hoi. hieu van lam truc va thanh va ((ca viet) OR (co viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y ((xang xa) OR (mang xa)) hoi. hieu van lam truc va thanh va ((ca viet) OR (co viet))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y ((xang xa) or (mang xa)) hoi. hieu van lam truc va thanh va ((ca viet) OR (co viet))*".