Perhaps you should try some spelling variations:
ban hanh » ban hang
truc ban » thuc ban, truc dan, truc van
cuu tre » cau tren, cau treo
cua tre » cua te, cua triet, dua tren
hanh de » hanh ve, hanh kem
hieu ve » hieu va, hieu van
lang xa » dang xay, lang van
lang ha » long ha
sai ky » sac ky
ve cau » ke cau, va cau, ve cac
te sai » te tai, te bai, te lai

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sai ky ((lang xa) or (lang ha)) hoi. hieu ve cau truc ban hanh de ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sai ky ((lang xa) OR (lang ha)) hoi. hieu ve cau truc ban hanh de ((cua tre) OR (cuu tre)).
• Adding a wildcard symbol may retrieve word variants: te sai ky ((lang xa) or (lang ha)) hoi. hieu ve cau truc ban hanh de ((cua tre) or (cuu tre))*.