Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
vien cac » vien bach, vien dai, vien da
tinh cua » trinh cua, sinh cua, tinh chat
van hanh » van thanh, ban hanh, van anh
van phan » van phong, van thanh, luan phan
cac xuc » cam xuc, cac nuoc, chat xuc
sach ky » sac ky, sach y, sach kem
nang xa » nang x, lang xa, nang ma
sach ty » sach y, sach tu, sach thu
cua tre » cua te, cuu tre, cua triet

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu ((sach ky) OR (sach ty)) nang xa hoi. hieu vien cac xuc ((van phan) or (van hanh)) tinh cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ky) OR (sach ty)) nang xa hoi. hieu vien cac xuc ((van phan) OR (van hanh)) tinh cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ky) OR (sach ty)) nang xa hoi. hieu vien cac xuc ((van phan) or (van hanh)) tinh cua tre".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) OR (sach ty)) nang xa hoi. hieu vien cac xuc ((van phan) or (van hanh)) tinh cua tre*.