Perhaps you should try some spelling variations:
hieu duoc » hiem duoc, hieu thuoc, hieu luc
duoc chat » doc chat, duoc pham, hoc chat
viet qua » vien quan, ket qua, viet ha
tu cach » tu cac
so sanh » do sanh
xuc van » duc van, luc van, xuc ban
vuc van » duc van, luc van, thuc van
qua tre » cua tre, quan tren, quan tri

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu cach) or (so sanh)) ky nang x ho. hieu duoc chat ((xuc van) OR (vuc van)) anh viet qua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu cach) OR (so sanh)) ky nang x ho. hieu duoc chat ((xuc van) OR (vuc van)) anh viet qua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu cach) or (so sanh)) ky nang x ho. hieu duoc chat ((xuc van) OR (vuc van)) anh viet qua tre".
• Adding a wildcard symbol may retrieve word variants: ((tu cach) or (so sanh)) ky nang x ho. hieu duoc chat ((xuc van) OR (vuc van)) anh viet qua tre*.