Perhaps you should try some spelling variations:
dau truc » cau truc, dai truc, doan truc
truc van » truc va, thuc van, truc ban
van hanh » van thanh, ban hanh, van anh
dua tren » dung tren
tu tieng » luc tieng, tu tuong, tu trong
tu sach » thu sach, su sach, te sach
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
y nang » ky nang, ly nang, v nang
va dau » va dao

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 va dau truc van hanh vi ((dua tren) OR (tu tieng))~.
• Adding a wildcard symbol may retrieve word variants: tu sach y nang xa hoi. hieu va dau truc van hanh vi ((dua tren) or (tu tieng))*.