Perhaps you should try some spelling variations:
duoc tren » nuoc tren, thuoc tren, dung tren
danh tai » doanh tai, dinh tai, hanh tai
dinh thi » dinh tri
cam truc » cau truc, nam truc, lam truoc
duc tre » duc tien
tu sach » thu sach, su sach, te sach
truc va » thuc va, thuc vat, trung va
hieu ve » hieu va, hieu van
nang xa » nang x, lang xa, nang ma
y nang » ky nang, ly nang, v nang
ve cam » ve cham, ve cac, va cam

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

• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang xa hoi. hieu ve cam truc va ((danh tai) OR (dinh thi)) ((duc tre) OR (duoc tren))~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y nang xa hoi. hieu ve cam truc va ((danh tai) or (dinh thi)) ((duc tre) OR (duoc tren))~".
• Adding a wildcard symbol may retrieve word variants: tu sach y nang xa hoi. hieu ve cam truc va ((danh tai) or (dinh thi)) ((duc tre) OR (duoc tren))*.