Perhaps you should try some spelling variations:
truc ngan » thu ngan, tri ngan, truc nano
sach ty » sach tu, sach thu, xach tay
hang vi » hang va, hanh vi, hang di
tu ngan » vu ngan, tu ngay, te ngan
ca tren » cau tren, cu tren, la tren
hieu ve » hieu va, hieu van
mang xa » lang xa, mang may, dang xay
ve cac » va cac, vien 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) or (sach y)) mang xa hoi. hieu ve cac ((truc ngan) OR (tu ngan)) hang vi ca tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ty) OR (sach y)) mang xa hoi. hieu ve cac ((truc ngan) OR (tu ngan)) hang vi ca tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ty) or (sach y)) mang xa hoi. hieu ve cac ((truc ngan) OR (tu ngan)) hang vi ca tren".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ty) or (sach y)) mang xa hoi. hieu ve cac ((truc ngan) OR (tu ngan)) hang vi ca tren*.