Perhaps you should try some spelling variations:
luyen tre » luyen tri, huyen tren, tuyen tren
hang cau » hang dau, hang ca, nhung cau
va hanh » van hanh, va thanh, va danh
luu tre » luu tru, cuu tre, luy tre
hieu va » lieu va, hieu qua
ky hang » ky nang, ly hang, ky dang
hieu ve » hieu van
sac ky » cac ky, sai ky
xuc va » duc va, tuc va, luc va
te sac » te sach, te cac, te san

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sac ky hang cau hoi. ((hieu ve) or (hieu va)) cam xuc va hanh vi ((luu tre) or (luyen tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sac ky hang cau hoi. ((hieu ve) OR (hieu va)) cam xuc va hanh vi ((luu tre) OR (luyen tre)).
• Adding a wildcard symbol may retrieve word variants: te sac ky hang cau hoi. ((hieu ve) or (hieu va)) cam xuc va hanh vi ((luu tre) or (luyen tre))*.