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