Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
sach tay » xach tay, sach hay, sach tai
hanh vai » hanh vi, hanh va, hanh tai
sach nay » sach hay, sach vay, sach nang
vai cua » dai cua, hai cua, lai cua
hieu va » lieu va, hieu qua
lang xa » lang ha, dang xay, lang van
loc va » luc va
va cau » van cau, va cac, va dau

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 tay) or (sach nay)) lang xa hoi. hieu va cau ((loc va) or (hoc va)) hanh vai cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach tay) OR (sach nay)) lang xa hoi. hieu va cau ((loc va) OR (hoc va)) hanh vai cua viet.
• Adding a wildcard symbol may retrieve word variants: su ((sach tay) or (sach nay)) lang xa hoi. hieu va cau ((loc va) or (hoc va)) hanh vai cua viet*.