Perhaps you should try some spelling variations:
truc ngan » tu ngan, thu ngan, tri ngan
dang xay » dang van, van xay
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
mang xa » lang xa, mang may, mang cua
hieu ve » hieu va, hieu van
hang vi » hang va, hanh vi, hang di
ca tren » cau tren, cu tren, la tren
ve cau » ke cau, va cau, ve cac
vi ca » vit ca, li ca, va ca

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 ty ((mang xa) OR (dang xay)) hoi. hieu ve cau truc ngan hang vi ca tren~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty ((mang xa) OR (dang xay)) hoi. hieu ve cau truc ngan hang vi ca tren".
• Adding a wildcard symbol may retrieve word variants: tu sach ty ((mang xa) OR (dang xay)) hoi. hieu ve cau truc ngan hang vi ca tren*.