Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc cac, hoc anh
vien cac » vien bach, vien dai, vien da
hanh tai » thanh tai, hang tai, han tai
van hanh » van thanh, ban hanh, van anh
ly quang » le quang, vu quang
tai duc » tai cuc, mai duc, tai du
tuc van » thuc van, truc van, tuc va
duc tre » duoc tren, duc tien
ve cac » va cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc sach ((ly hang) or (ly quang)) xa hoi. hieu ((ve cac) or (vien cac)) tuc van hanh tai duc tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc sach ((ly hang) OR (ly quang)) xa hoi. hieu ((ve cac) OR (vien cac)) tuc van hanh tai duc tre.
• Adding a wildcard symbol may retrieve word variants: hoc sach ((ly hang) or (ly quang)) xa hoi. hieu ((ve cac) or (vien cac)) tuc van hanh tai duc tre*.