Perhaps you should try some spelling variations:
thanh tai » thanh hai, thanh toan, doanh tai
cuc tieu » muc tieu, cac tieu, cach tieu
va thanh » gia thanh, ban thanh, va tinh
hieu van » hieu va, thien van, lieu va
tang ma » mang may, tang van
sach ky » sach y, sach ty, sach kem
van cam » van nam, van lam, van cau
cam tuc » cam xuc, cam tu, nam thuc
ma hoi » mai hoi, xa hoi, ma hoa
sac ky » cac ky, sai ky
tuc va » thuc va, truc va, tuc xa
cuc te » cua te, cuc thue

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 ky) or (sac ky)) tang ma hoi. hieu van cam tuc va thanh tai ((cuc te) OR (cuc tieu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ky) OR (sac ky)) tang ma hoi. hieu van cam tuc va thanh tai ((cuc te) OR (cuc tieu)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach ky) or (sac ky)) tang ma hoi. hieu van cam tuc va thanh tai ((cuc te) OR (cuc tieu))".
• Adding a wildcard symbol may retrieve word variants: tu ((sach ky) or (sac ky)) tang ma hoi. hieu van cam tuc va thanh tai ((cuc te) OR (cuc tieu))*.