Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
danh sai » dung sai, danh bat, danh dau
sai cau » lai chau, mai chau, hai chau
va danh » va dinh, va dan, va hanh
tu sach » thu sach, su sach, te sach
lang xa » lang ha, dang xay, lang van
ty lang » tay lang, ty xang, ty hang
xuc va » duc va, tuc va, luc va
ve 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 (thu hoach)) ty lang xa hoi. hieu ((ve cac) OR (va cac)) xuc va danh sai cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu hoach)) ty lang xa hoi. hieu ((ve cac) OR (va cac)) xuc va danh sai cau tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (thu hoach)) ty lang xa hoi. hieu ((ve cac) OR (va cac)) xuc va danh sai cau tren".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu hoach)) ty lang xa hoi. hieu ((ve cac) OR (va cac)) xuc va danh sai cau tren*.