Perhaps you should try some spelling variations:
hanh dai » hanh tai, hanh dao, vanh dai
thuc dan » thuc hanh, hoc dan, thuc vat
cua tre » cua te, cuu tre, cua triet
duc van » duc va, duc tan, duc manh
hieu ve » hieu va, hieu van
lang ha » long ha
tang ha » tang ma, trung ha, tang van
sac ky » cac ky, sai ky
ve cam » ve cham, ve cac, va cam
tu sac » tu sach, tu cac, tu san

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sac ky ((tang ha) or (lang ha)) hoi. hieu ve cam ((thuc dan) or (duc van)) hanh dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky ((tang ha) OR (lang ha)) hoi. hieu ve cam ((thuc dan) OR (duc van)) hanh dai cua tre.
• Adding a wildcard symbol may retrieve word variants: tu sac ky ((tang ha) or (lang ha)) hoi. hieu ve cam ((thuc dan) or (duc van)) hanh dai cua tre*.