Perhaps you should try some spelling variations:
hanh vai » hanh vi, hanh va, hanh tai
sach vay » sach va, sach hay, sach nay
va hanh » van hanh, va thanh, va danh
hieu ve » hieu va, hieu van
vai hoa » van hoa, va hoa, dai hoa
lang xa » lang ha, dang xay, lang van
sach 2 » sach y
nam tu » nam thuc

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 vay) or (sach 2)) lang xa hoi. hieu ve ((nam tu) OR (nam thu)) va hanh vai hoa viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach vay) OR (sach 2)) lang xa hoi. hieu ve ((nam tu) OR (nam thu)) va hanh vai hoa viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach vay) or (sach 2)) lang xa hoi. hieu ve ((nam tu) OR (nam thu)) va hanh vai hoa viet".
• Adding a wildcard symbol may retrieve word variants: su ((sach vay) or (sach 2)) lang xa hoi. hieu ve ((nam tu) OR (nam thu)) va hanh vai hoa viet*.