Perhaps you should try some spelling variations:
hieu quan » lieu quan, thien quan, lien quan
sach tay » xach tay, sach hay, sach nay
van hanh » van thanh, ban hanh, van anh
truc van » truc va, thuc van, truc ban
cam truc » cau truc, nam truc, lam truoc
te sach » toc sach
cua tuc » cua duc, cua tu, cua thuoc
tang ma » mang may, tang van
tang xa » trang xa, lang xa, tang ha
vi cua » vai cua, di cua

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

• If you are trying to use Boolean operators, they must be ALL CAPS: te sach tay ((tang xa) OR (tang ma)) hoi. ((hieu qua) OR (hieu quan)) cam truc van hanh vi cua tuc~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach tay ((tang xa) OR (tang ma)) hoi. ((hieu qua) or (hieu quan)) cam truc van hanh vi cua tuc~".
• Adding a wildcard symbol may retrieve word variants: te sach tay ((tang xa) OR (tang ma)) hoi. ((hieu qua) or (hieu quan)) cam truc van hanh vi cua tuc*.