Perhaps you should try some spelling variations:
nam thuc » nam thuoc, am thuc, nam thu
cau tren » cu tren, dau tren, ca tren
tu sach » thu sach, su sach, te sach
nang xa » nang x, lang xa, nang ma
qua nam » quan nam, cua nam, quang nam
thuc va » thuc vat, thuc dan, thuc day
danh va » doanh va, hanh va, dan va
tu sac » tu cac, tu san, tu bac
anh va » hanh va

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sac) or (tu sach)) ky nang xa hoi. hieu qua nam thuc va ((danh va) OR (anh va)) cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sac) OR (tu sach)) ky nang xa hoi. hieu qua nam thuc va ((danh va) OR (anh va)) cau tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sac) or (tu sach)) ky nang xa hoi. hieu qua nam thuc va ((danh va) OR (anh va)) cau tren".
• Adding a wildcard symbol may retrieve word variants: ((tu sac) or (tu sach)) ky nang xa hoi. hieu qua nam thuc va ((danh va) OR (anh va)) cau tren*.