Perhaps you should try some spelling variations:
thieu nien » thien nhien
hieu vien » hieu hien, hieu viec, hieu tieng
hanh dai » hanh tai, hanh dao, vanh dai
van hanh » van thanh, ban hanh, van anh
sang tao » hang tai
dai van » dao van, dai han, dai va
sach ty » sach y, sach tu, sach thu
sach ky » sac ky, sach y, sach kem
cac dai » cac dan, cac bai, can dai
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: su ((sach ky) or (sach ty)) sang tao boi. ((hieu vien) or (thieu nien)) cac dai van hanh dai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ky) OR (sach ty)) sang tao boi. ((hieu vien) OR (thieu nien)) cac dai van hanh dai cua te.
• Adding a wildcard symbol may retrieve word variants: su ((sach ky) or (sach ty)) sang tao boi. ((hieu vien) or (thieu nien)) cac dai van hanh dai cua te*.