Perhaps you should try some spelling variations:
hang dau » hang va, hang tai
hanh tai » thanh tai, hang tai, han tai
cuc tre » duc tre, cua tre, cuu tre
va hanh » van hanh, va thanh, va danh
dau hoi » cau hoi, dai hoi, dan hoi
sach ty » sach y, sach tu, sach thu
sac ky » cac ky, sai ky
ve cam » ve cham, va cam, ve cai
ve cac » va cac, vien cac
luc va » duc va, tuc va, loc va

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

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