Perhaps you should try some spelling variations:
thuc va » thuc vat, thuc dan, thuc day
tu sach » thu sach, su sach, te sach
nang xa » nang x, lang xa, nang ma
cua tre » cua te, cuu tre, cua triet
va cam » va cham, va cac, va cai
va cao » va cac, va co, va dao
y nang » ky nang, ly nang, v nang
dan di » danh di, dan da, dan li
dan de » dan den, dang de, van de

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