Perhaps you should try some spelling variations:
truc van » truc va, thuc van, truc ban
ky lang » ky nang, ky dang, ky tang
hieu va » lieu va, hieu qua
hanh de » hanh ve, hanh kem
te sac » te sach, te cac, te san
sac ky » cac ky, sai ky
ha hoi » hoa hoi, xa hoi, va hoi
va cau » van cau, va cac, va dau

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

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