Perhaps you should try some spelling variations:
thuc dan » thuc hanh, hoc dan, thuc vat
tu sach » thu sach, su sach, te sach
thi lan » thi hanh, thi nang, thi lien
hanh va » hang va, hanh vi
sach ty » sach y, sach tu, sach thu
thi van » thi hanh, thi nang
nang xa » nang x, lang xa, nang ma
ty nang » ky nang, ty xang, ty hang
cuu tre » cua tre, cau tren, cau treo
xuc va » duc va, tuc va, luc va
va cuu » va cau, va chu, va huu

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 hoi. ((thi van) OR (thi lan)) cam ((xuc va) or (thuc dan)) hanh va cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty nang xa hoi. ((thi van) OR (thi lan)) cam ((xuc va) OR (thuc dan)) hanh va cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty nang xa hoi. ((thi van) OR (thi lan)) cam ((xuc va) or (thuc dan)) hanh va cuu tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang xa hoi. ((thi van) OR (thi lan)) cam ((xuc va) or (thuc dan)) hanh va cuu tre*.