Perhaps you should try some spelling variations:
tham thuc » nham thuc, pham thuc, tam thuc
hanh dao » lanh dao, thanh dat, thanh dam
dan hanh » dang hanh, dan khanh, dan thanh
nang tai » hang tai, tang tai, sang tai
thuc dan » thuc hanh, hoc dan, thuc vat
vi tham » vi pham, va tham, vi than
sach ky » sach y, sach ty, sach kem
hieu vi » hieu voi, hieu va, hieu ve
tai hoi » tai khoi, dai hoi, tai hai
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: su ((sach ky) or (sac ky)) nang tai hoi. hieu vi tham thuc dan hanh dao ((cua te) OR (cua tu))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ky) OR (sac ky)) nang tai hoi. hieu vi tham thuc dan hanh dao ((cua te) OR (cua tu)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach ky) or (sac ky)) nang tai hoi. hieu vi tham thuc dan hanh dao ((cua te) OR (cua tu))".
• Adding a wildcard symbol may retrieve word variants: su ((sach ky) or (sac ky)) nang tai hoi. hieu vi tham thuc dan hanh dao ((cua te) OR (cua tu))*.