Perhaps you should try some spelling variations:
su sach » so sach, vu sach
lang xa » lang ha, dang xay, lang van
anh lai » anh bai, anh tai, gianh lai
lai cuu » lai cua, lai chau, lai cuoc
cuu tre » cua tre, cau tren, cau treo
sach o » sach lo, sac o, sach y
o lang » hoa lang, hoi lang
ve cai » va cai, ve cac, ve tai
va cam » va cham, va cac, va cao
va anh » van anh, va danh, va hanh

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 o lang xa hoi. hieu ((ve cai) or (va cam)) duc va anh lai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach o lang xa hoi. hieu ((ve cai) OR (va cam)) duc va anh lai cuu tre.
• Adding a wildcard symbol may retrieve word variants: su sach o lang xa hoi. hieu ((ve cai) or (va cam)) duc va anh lai cuu tre*.