Perhaps you should try some spelling variations:
tang dai » tang tai, tang dan, lang dai
hieu sau » hieu su, hieu suat, tieu su
ky tang » ky nang, ky dang, kho tang
dai moi » doi moi, dai hoi
sau cam » sau lam, cau cham, sau chan
tu sac » tu sach, tu cac, tu san
cua tu » cua tuc, cua cu, cua te
xuc va » duc va, luc va, xac va
tuc va » thuc va, truc va, tuc xa
sac ky » cac ky, sai ky
cua su » qua su

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 tang dai moi. hieu sau cam ((xuc va) or (tuc va)) hanh vi ((cua tu) OR (cua su))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky tang dai moi. hieu sau cam ((xuc va) OR (tuc va)) hanh vi ((cua tu) OR (cua su)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky tang dai moi. hieu sau cam ((xuc va) or (tuc va)) hanh vi ((cua tu) OR (cua su))".
• Adding a wildcard symbol may retrieve word variants: tu sac ky tang dai moi. hieu sau cam ((xuc va) or (tuc va)) hanh vi ((cua tu) OR (cua su))*.