Perhaps you should try some spelling variations:
hanh tai » thanh tai, hang tai, han tai
van hanh » van thanh, ban hanh, van anh
tang hai » hang hai, tang tai, tang ha
tu sach » thu sach, su sach, tu cach
tai cuu » tai cuc, tai buu, tai cua
luc van » luoc van, luu van, duc van
cuu tre » cua tre, cau tren, cau treo
hai hoi » dai hoi, hai moi, hai hai
ky tang » ky nang, ky dang, kho tang
te sach » toc sach
va cam » va cham, va cac, va cao
ve cac » va cac, vien cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) or (te sach)) ky tang hai hoi. hieu ((ve cac) or (va cam)) luc van hanh tai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (te sach)) ky tang hai hoi. hieu ((ve cac) OR (va cam)) luc van hanh tai cuu tre.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (te sach)) ky tang hai hoi. hieu ((ve cac) or (va cam)) luc van hanh tai cuu tre*.