Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
sach tham » sach nha
toc sach » hoc sach, doc sach, thuoc sach
van hanh » van thanh, ban hanh, van anh
vien cac » vien bach, vien dai, vien da
cac vuc » cac nuoc, cac vung, cac cuoc
vuc van » duc van, luc van, thuc van
nang xa » lang xa, nang ma, mang xa
vai cua » dai cua, hai cua, bai cua
lai cua » dai cua, hai cua, lai chau

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach tham ((nang xa) or (nang x)) hoi. hieu vien cac vuc van hanh ((vai cua) or (lai cua)) cu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach tham ((nang xa) OR (nang x)) hoi. hieu vien cac vuc van hanh ((vai cua) OR (lai cua)) cu.
• Adding a wildcard symbol may retrieve word variants: toc sach tham ((nang xa) or (nang x)) hoi. hieu vien cac vuc van hanh ((vai cua) or (lai cua)) cu*.