Perhaps you should try some spelling variations:
chieu sang » chieu sach, chieu xanh, hieu lang
nham thuc » nhan thuc, nam thuc, nham thu
hieu san » hieu van, hieu sau, hieu suat
vat hanh » vat thanh, van hanh, va hanh
tu cach » tu cac
hoc cac » hoc cao
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
cua tre » cua te, cuu tre, cua triet
vi cua » vai cua, di cua

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 (hoc cac)) ky lang xa hoi. ((hieu san) OR (chieu sang)) nham thuc vat hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu cach) OR (hoc cac)) ky lang xa hoi. ((hieu san) OR (chieu sang)) nham thuc vat hanh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu cach) or (hoc cac)) ky lang xa hoi. ((hieu san) OR (chieu sang)) nham thuc vat hanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: ((tu cach) or (hoc cac)) ky lang xa hoi. ((hieu san) OR (chieu sang)) nham thuc vat hanh vi cua tre*.