Perhaps you should try some spelling variations:
tham thuc » nham thuc, pham thuc, tam thuc
thanh dat » thanh san, thanh hai, thanh van
nang tai » hang tai, tang tai, sang tai
hanh dao » lanh dao, thanh dam, doanh dao
thuc va » thuc vat, thuc dan, thuc day
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 te » cua tu

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 va ((hanh dao) OR (thanh dat)) cua te~.
• 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 va ((hanh dao) OR (thanh dat)) cua te.
• 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 va ((hanh dao) OR (thanh dat)) cua te".
• Adding a wildcard symbol may retrieve word variants: su ((sach ky) or (sac ky)) nang tai hoi. hieu vi tham thuc va ((hanh dao) OR (thanh dat)) cua te*.