Perhaps you should try some spelling variations:
cua triet » su triet, va triet
qua cham » qua hai, qua cac, va cham
hanh dao » lanh dao, thanh dat, thanh dam
cua viet » ca viet, hoa viet, cua vat
vu sach » vu bach, su sach, vu khach
sach ly » sach y, sach lo, sach ty
ly lang » ly hang, ly vang, le lang
lang xa » lang ha, dang xay, lang van

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach ly lang xa hoi. hieu qua cham ((duc va) or (thuc vat)) hanh dao ((cua triet) or (cua viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ly lang xa hoi. hieu qua cham ((duc va) OR (thuc vat)) hanh dao ((cua triet) OR (cua viet)).
• Adding a wildcard symbol may retrieve word variants: vu sach ly lang xa hoi. hieu qua cham ((duc va) or (thuc vat)) hanh dao ((cua triet) or (cua viet))*.