Perhaps you should try some spelling variations:
luan thuc » dan thuc, nhan thuc, toan thuc
dau tieng » dau tien, cau tieng, day tieng
hieu van » hieu va, thien van, lieu va
van luan » van quan, van tuan, von luan
hanh tai » thanh tai, hang tai, han tai
co sach » bo sach, cuon sach, hoc sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
thuc va » thuc vat, thuc dan, thuc day
va hanh » van hanh, va thanh, ban hanh
tai dau » tac dau, tai du, thi dau
nang o » nang co, nang ho, nang ro
o hai » co hai, so hai, o lai

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

• Performing a fuzzy search may retrieve terms with similar spellings: co sach ty nang o hai. hieu van luan thuc va hanh tai dau tieng~.
• Adding a wildcard symbol may retrieve word variants: co sach ty nang o hai. hieu van luan thuc va hanh tai dau tieng*.