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

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) OR (thuc dan)) danh 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) OR (thuc dan)) danh 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) OR (thuc dan)) danh 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) OR (thuc dan)) danh va cau tren*.