Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
van hanh » van thanh, ban hanh, van anh
bai phoi » bai choi, bai hoc, dai hoi
dai luoc » dai luong, khai luoc, dai hoc
dai luc » dai luan, dai thuc, dai truc
va danh » va dinh, va dan, va hanh
tu sac » tu sach, tu cac, tu san
vi cua » vai cua, di cua
sac ky » cac ky, sai ky
ky va » ly va, ke va, my va

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sac ky va bai phoi. hieu vien ((dai luc) or (dai luoc)) ((van hanh) or (va danh)) vi cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky va bai phoi. hieu vien ((dai luc) OR (dai luoc)) ((van hanh) OR (va danh)) vi cua vat.
• Adding a wildcard symbol may retrieve word variants: tu sac ky va bai phoi. hieu vien ((dai luc) or (dai luoc)) ((van hanh) or (va danh)) vi cua vat*.