Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
hanh tai » thanh tai, hang tai, han tai
su sach » so sach, vu sach
tai cua » thai cua, tai cuc, tri cua
hang ca » nang cao, hang tai, hang dau
sach ly » sach y, sach lo, sach ty
tuc van » thuc van, truc van, tuc va
ve cac » vien cac
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 ly ((hang va) or (hang ca)) hoi. hieu ((ve cac) or (va cac)) tuc van hanh tai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ly ((hang va) OR (hang ca)) hoi. hieu ((ve cac) OR (va cac)) tuc van hanh tai cua te.
• Adding a wildcard symbol may retrieve word variants: su sach ly ((hang va) or (hang ca)) hoi. hieu ((ve cac) or (va cac)) tuc van hanh tai cua te*.