Perhaps you should try some spelling variations:
nhanh thai » nhanh thi, nhanh thanh, nhanh thang
hanh tai » thanh tai, hang tai, han tai
cua tre » cua te, cuu tre, cua triet
cam tuc » cam xuc, cam tu, nam thuc
hieu va » lieu va
dang xa » dang xay, lang xa, dang ha
ky dang » ky nang, ky danh
sac ky » cac ky, sai ky
tuc va » thuc va, truc va, tuc xa
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 dang xa hoi. ((hieu va) OR (hieu qua)) cam tuc va ((nhanh thai) or (hanh tai)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sac ky dang xa hoi. ((hieu va) OR (hieu qua)) cam tuc va ((nhanh thai) OR (hanh tai)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sac ky dang xa hoi. ((hieu va) OR (hieu qua)) cam tuc va ((nhanh thai) or (hanh tai)) cua tre".
• Adding a wildcard symbol may retrieve word variants: te sac ky dang xa hoi. ((hieu va) OR (hieu qua)) cam tuc va ((nhanh thai) or (hanh tai)) cua tre*.