Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
sach lo » sach dao, sach doi, sach hoi
cua tre » cua te, cuu tre, cua triet
tu sach » thu sach, su sach, te sach
hieu va » lieu va, hieu qua
nang xa » nang x, lang xa, nang ma
lo nang » ho nang, ly nang, loai nang
va cam » va cham, va cac, va cao
xuc va » duc va, luc va, xac va
tuc va » thuc va, truc va, tuc xa

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