Perhaps you should try some spelling variations:
hieu vien » hieu hien, hieu viec, thieu nien
bach luoc » bach tuoc, sach duoc, sach nuoc
nang mai » nang ma, nang tai, lang mai
luoc van » luoc can, luoc va, luc van
van hanh » van thanh, ban hanh, van anh
mai hoi » mai khoi, dai hoi, lai hoi
tu bai » te bai
tu bat » tu dat
tu ban » thu ban, te ban
vi cua » vai cua, di cua
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: ((tu bai) or (((tu bat) OR (tu ban)))) ky nang mai hoi. hieu vien bach luoc van hanh vi cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu bai) OR (((tu bat) OR (tu ban)))) ky nang mai hoi. hieu vien bach luoc van hanh vi cua tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu bai) or (((tu bat) OR (tu ban)))) ky nang mai hoi. hieu vien bach luoc van hanh vi cua tu".
• Adding a wildcard symbol may retrieve word variants: ((tu bai) or (((tu bat) OR (tu ban)))) ky nang mai hoi. hieu vien bach luoc van hanh vi cua tu*.