Perhaps you should try some spelling variations:
hanh doi » thanh doi, hanh noi, hang doi
sach ky » sach y, sach ty, sach kem
nang ma » tang ma, sang ma, nang cao
hieu le » hieu ve, hieu he, hieu ly
thue va » thuc va, thuyet va, thuc vat
doi cua » dai cua, hoi cua
sac ky » cac ky, sai ky
ma hoi » mai hoi, xa hoi, ma hoa
le nam » ly nam, he nam, le na

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 ky) OR (sac ky)) nang ma hoi. hieu le nam ((thu ha) or (thue va)) hanh doi cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ky) OR (sac ky)) nang ma hoi. hieu le nam ((thu ha) OR (thue va)) hanh doi cua vat.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach ky) OR (sac ky)) nang ma hoi. hieu le nam ((thu ha) or (thue va)) hanh doi cua vat".
• Adding a wildcard symbol may retrieve word variants: su ((sach ky) OR (sac ky)) nang ma hoi. hieu le nam ((thu ha) or (thue va)) hanh doi cua vat*.