Perhaps you should try some spelling variations:
hieu cua » hieu qua, dieu cua, bieu cua
anh thai » anh thi, anh tai, nhanh thai
lang van » dang van, tang van, hoang van
cua cam » cua cac, cua cay, cua tam
anh hai » lanh hai, manh hai, anh bai
xuc ban » duc ban, cuc ban, quoc ban
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
nang xa » nang x, lang xa, nang ma
cua tre » cua te, cuu tre, cua triet

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ty ((nang xa) or (lang van)) hoi. hieu cua cam xuc ban ((anh hai) OR (anh thai)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty ((nang xa) OR (lang van)) hoi. hieu cua cam xuc ban ((anh hai) OR (anh thai)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty ((nang xa) or (lang van)) hoi. hieu cua cam xuc ban ((anh hai) OR (anh thai)) cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ty ((nang xa) or (lang van)) hoi. hieu cua cam xuc ban ((anh hai) OR (anh thai)) cua tre*.