Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
vien cac » vien bach, vien dai, vien da
van hanh » van thanh, ban hanh, van ban
cac xuc » cam xuc, cac nuoc, chat xuc
doi cua » dai cua, hoi cua
van anh » van thanh, tuan anh, van minh
te sach » toc sach
sach lo » sach dao, sach doi, sach hoi
lang ha » long ha
cua cu » cua chu, cua cau, cua su

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

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