Perhaps you should try some spelling variations:
hieu thi » sieu thi, hieu chi, hiep thi
ban hanh » ban hang
cau tren » cu tren, dau tren, ca tren
tu sach » thu sach, su sach, te sach
lang ha » long ha
thi ha » thi hai, thi hanh
tu ban » thu ban, te ban
vi cau » va cau, ve cau, di cau
ha tu » nha tu, ha thu, va tu

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 ((nang cao) or (lang ha)) hoi. hieu thi ha tu ban hanh vi cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y ((nang cao) OR (lang ha)) hoi. hieu thi ha tu ban hanh vi cau tren.
• Adding a wildcard symbol may retrieve word variants: tu sach y ((nang cao) or (lang ha)) hoi. hieu thi ha tu ban hanh vi cau tren*.