Perhaps you should try some spelling variations:
ve triet » va trien, su triet
sach thi » sach thu, sach tai, sach thieu
thanh ha » thanh hoa, thanh hai, nhanh ha
va triet » va thiet, va trien, cua triet
hanh dam » thanh dam, hanh lam, hanh nam
tu sach » thu sach, su sach, te sach
thuc va » thuc vat, thuc dan, thuc day
hieu va » lieu va, hieu qua
va cau » van cau, va cac, va dau
ha hoi » hoa hoi, ha noi, xa hoi

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 thi thanh ha hoi. hieu va cau ((thuc va) or (tuc xa)) hanh dam ((va triet) OR (ve triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach thi thanh ha hoi. hieu va cau ((thuc va) OR (tuc xa)) hanh dam ((va triet) OR (ve triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach thi thanh ha hoi. hieu va cau ((thuc va) or (tuc xa)) hanh dam ((va triet) OR (ve triet))".
• Adding a wildcard symbol may retrieve word variants: tu sach thi thanh ha hoi. hieu va cau ((thuc va) or (tuc xa)) hanh dam ((va triet) OR (ve triet))*.