Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
nam thuc » nam thuoc, am thuc, nam thu
hanh tri » thanh tri, hanh tai, hanh trinh
sach ky » sach y, sach ty, sach kem
lang xa » lang ha, dang xay, lang van
thuc va » thuc vat, thuc dan, thuc day
va hanh » van hanh, va thanh, va danh
sac ky » cac ky
cua tu » cua tuc, cua su, cua cu

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

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