Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
nam thuc » nam thuoc, am thuc, nam thu
thuc day » thuc dan, thuc vat
day hanh » day nhanh, day thanh, dao hanh
tu sach » thu sach, te sach, tu cach
su sach » so sach, vu sach
luu tre » luu tru, cuu tre, luy tre
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 (su sach)) ky nang x ho. hieu van nam thuc day hanh vi luu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) ky nang x ho. hieu van nam thuc day hanh vi luu tre.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (su sach)) ky nang x ho. hieu van nam thuc day hanh vi luu tre*.