Perhaps you should try some spelling variations:
hanh tai » thanh tai, hang tai, han tai
lang hai » lang chai, lang thai, lang ha
van hanh » van thanh, ban hanh, van anh
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
luc van » luoc van, luu van, duc van
buu tre » cuu tre
hai hoi » dai hoi, hai moi, hai hai
ky lang » ky nang, ky dang, ky tang
ve cac » va cac, vien cac
va cao » va cac, va co, va dao
ve cam » ve cham, va cam, ve cai

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 ky lang hai hoi. hieu ((((ve cam) OR (ve cac))) or (va cao)) luc van hanh tai buu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky lang hai hoi. hieu ((((ve cam) OR (ve cac))) OR (va cao)) luc van hanh tai buu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky lang hai hoi. hieu ((((ve cam) OR (ve cac))) or (va cao)) luc van hanh tai buu tre".
• Adding a wildcard symbol may retrieve word variants: su sach ky lang hai hoi. hieu ((((ve cam) OR (ve cac))) or (va cao)) luc van hanh tai buu tre*.