Perhaps you should try some spelling variations:
cham truc » cau truc, nham thuc, pham thuc
mai khoi » mai khoa, tai khoa, cac khoi
cua tre » cua te, cuu tre, cua triet
hanh de » hanh ve, hanh kem
hanh di » hanh vi, hang di, danh di
truc va » thuc va, thuc vat, trung va
ve cham » va cham, ve chat, vu cham
hieu ve » hieu va, hieu van
mai hoi » dai hoi, lai hoi, mai doi
ky tang » ky nang, ky dang, kho tang
sac ky » cac ky, sai ky
vu sac » vu sach, vu san, va sac

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu sac ky tang ((mai hoi) or (mai khoi)). hieu ve cham truc va ((hanh di) OR (hanh de)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sac ky tang ((mai hoi) OR (mai khoi)). hieu ve cham truc va ((hanh di) OR (hanh de)) cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sac ky tang ((mai hoi) or (mai khoi)). hieu ve cham truc va ((hanh di) OR (hanh de)) cua tre*".