Perhaps you should try some spelling variations:
thanh dam » thanh dat, thanh nam, thanh tam
va triet » va thiet, va trien, ve triet
hanh dao » lanh dao, thanh dat, doanh dao
tang mai » tang ma, tang tai, lang mai
thuc dan » thuc hanh, hoc dan, thuc vat
ky tang » ky nang, ky dang, kho tang
mai hoi » mai khoi, dai hoi, lai hoi
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
su sac » su sach, su cac, su xac
sac ky » cac ky, sai ky
tuc va » thuc va, truc va, tuc xa

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: su sac ky tang mai hoi. hieu ve cham ((tuc va) or (thuc dan)) ((hanh dao) or (thanh dam)) va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sac ky tang mai hoi. hieu ve cham ((tuc va) OR (thuc dan)) ((hanh dao) OR (thanh dam)) va triet.
• Adding a wildcard symbol may retrieve word variants: su sac ky tang mai hoi. hieu ve cham ((tuc va) or (thuc dan)) ((hanh dao) or (thanh dam)) va triet*.