Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
cac truc » cau truc, cac tru, cac trung
nang xa » nang x, lang xa, nang ma
hieu va » lieu va
sach ky » sac ky, sach y, sach ty
truc va » thuc va, thuc vat, trung va
va dinh » van dinh, va kinh, va tinh
dinh ca » dinh cac, dinh cua, dinh cao
cuu tre » cua tre, cau treo
te sach » toc sach

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

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