Perhaps you should try some spelling variations:
thanh hai » thanh phan, thanh hoa, thanh san
dang xay » dang van, van xay
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
cac hoc » cach hoc, cac hop, bac hoc
hoc gia » hoc giao, hoc giai, toc gia
hai cua » thai cua, dai cua, hoi cua
te sac » te sach, te san
te cac » tu cac, ve cac, te cao
cua te » cua tu

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) OR (te cac)) ky ((nang xa) or (dang xay)) hoi. hieu va cac hoc gia thanh hai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sac) OR (te cac)) ky ((nang xa) OR (dang xay)) hoi. hieu va cac hoc gia thanh hai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sac) OR (te cac)) ky ((nang xa) or (dang xay)) hoi. hieu va cac hoc gia thanh hai cua te".
• Adding a wildcard symbol may retrieve word variants: ((te sac) OR (te cac)) ky ((nang xa) or (dang xay)) hoi. hieu va cac hoc gia thanh hai cua te*.