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

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 ((xang xa) or (lang xa)) hoi. hieu ve cau truc ngan hang vi ((ca tren) or (cu tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty ((xang xa) OR (lang xa)) hoi. hieu ve cau truc ngan hang vi ((ca tren) OR (cu tren)).
• Adding a wildcard symbol may retrieve word variants: tu sach ty ((xang xa) or (lang xa)) hoi. hieu ve cau truc ngan hang vi ((ca tren) or (cu tren))*.