Perhaps you should try some spelling variations:
nham thuc » nhan thuc, nam thuc, nham thu
nang hoi » nang noi, nang hoc, nang ho
hieu van » thien van, lieu va, hieu ve
day hanh » day nhanh, day thanh, dao hanh
thuc day » thuc dan, thuc vat
thu sac » thu sach, thu san, thu xac
hanh di » hanh vi, hanh de, hang di
hieu va » lieu va, hieu qua
hoi hoi » hoi hoc, hoc hoi, hoi doi
sac ky » cac ky, sai ky
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: thu sac ky nang hoi hoi. ((hieu van) or (hieu va)) nham thuc day hanh di ((cua te) or (cua tu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sac ky nang hoi hoi. ((hieu van) OR (hieu va)) nham thuc day hanh di ((cua te) OR (cua tu)).
• Adding a wildcard symbol may retrieve word variants: thu sac ky nang hoi hoi. ((hieu van) or (hieu va)) nham thuc day hanh di ((cua te) or (cua tu))*.