Perhaps you should try some spelling variations:
thanh vi » hanh vi, thanh va, thanh ve
va thanh » gia thanh, ban thanh, va tinh
nam thuc » nam thuoc, am thuc, nam thu
hieu van » hieu va, thien van, lieu va
tu sach » thu sach, su sach, tu cach
thuc va » thuc vat, thuc dan, thuc day
luu tre » luu tru, cuu tre, luy tre
ky tang » ky nang, ky dang, kho tang
te sach » toc sach
ma hoi » mai hoi, ma hoa, me hoi
vi luu » vi lua

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) or (te sach)) ky tang ((ma hoi) OR (xa hoi)). hieu van nam thuc va thanh vi luu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (te sach)) ky tang ((ma hoi) OR (xa hoi)). hieu van nam thuc va thanh vi luu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (te sach)) ky tang ((ma hoi) OR (xa hoi)). hieu van nam thuc va thanh vi luu tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (te sach)) ky tang ((ma hoi) OR (xa hoi)). hieu van nam thuc va thanh vi luu tre*.