Perhaps you should try some spelling variations:
hanh tai » thanh tai, hang tai, han tai
tang dan » tang van, tung dan, tang luan
hieu va » lieu va, hieu qua
xuc van » luc van, vuc van, xuc ban
tai cua » thai cua, tai cuc, tri cua
dan hoc » van hoc, dan toc, dai hoc
duc van » duc va, duc tan, duc manh
va chat » van chat, va phat, cao chat
sac ky » cac ky
cua te » cua tu

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

• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sai ky) OR (sac ky)) tang dan hoc. hieu va chat ((xuc van) OR (duc van)) hanh tai cua te~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sai ky) OR (sac ky)) tang dan hoc. hieu va chat ((xuc van) or (duc van)) hanh tai cua te~".
• Adding a wildcard symbol may retrieve word variants: tu ((sai ky) OR (sac ky)) tang dan hoc. hieu va chat ((xuc van) or (duc van)) hanh tai cua te*.