Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
vat tinh » sat tinh, vat sinh, hoat tinh
sach ky » sac ky, sach y, sach ty
tinh va » tich va, trinh van, trinh vat
vu sach » vu bach, su sach, vu khach
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
ve cau » ke cau, va cau, le cau
ve cac » va cac, vien cac
cua tu » cua tuc, cua su, cua cu

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