Perhaps you should try some spelling variations:
nam truc » nam truoc, nam thuc, nam trung
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
truc va » thuc va, thuc vat, trung va
va tinh » may tinh
tinh vi » trinh vi, tinh voi, tinh va
cua tre » cua te, cuu tre, cua triet
cua tuc » cua duc, cua thuoc, luat tuc
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai ky
va nam » van nam, ha nam, va nay
cua tu » cua su, cua cu, cua te

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 nang xa hoi. hieu va nam truc va tinh vi ((cua tre) or (((cua tu) OR (cua tuc))))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky nang xa hoi. hieu va nam truc va tinh vi ((cua tre) OR (((cua tu) OR (cua tuc)))).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky nang xa hoi. hieu va nam truc va tinh vi ((cua tre) or (((cua tu) OR (cua tuc))))".
• Adding a wildcard symbol may retrieve word variants: tu sac ky nang xa hoi. hieu va nam truc va tinh vi ((cua tre) or (((cua tu) OR (cua tuc))))*.