Perhaps you should try some spelling variations:
tham thuc » nham thuc, pham thuc, tam thuc
tai khoi » tai khoa, mai khoi, tao khoi
hieu van » hieu va, thien van, lieu va
van tham » van thanh, van tuan, van chat
thuc van » thuc vat, thuc dan, thuc va
van hanh » van thanh, ban hanh, van anh
hanh dai » hanh tai, hanh dao, vanh dai
so sach » so sanh, bo sach, co sach
tai hoi » dai hoi, tai hai, tai hoe
y nang » ky nang, ly nang, v nang
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: so sach y nang ((tai hoi) or (tai khoi)). hieu van tham thuc van hanh dai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach y nang ((tai hoi) OR (tai khoi)). hieu van tham thuc van hanh dai cua te.
• Adding a wildcard symbol may retrieve word variants: so sach y nang ((tai hoi) or (tai khoi)). hieu van tham thuc van hanh dai cua te*.