Perhaps you should try some spelling variations:
tu sach » thu sach, su sach, te sach
dinh ve » dinh ket, dinh van
dinh vu » dich vu, dinh cu, dinh du
cam luc » cam xuc, cau luc
sach ty » sach y, sach tu, sach thu
hieu ve » hieu va, hieu van
ty nang » ky nang, ty xang, ty hang
ve cam » ve cham, ve cac, va cam
luc va » duc va, tuc va, loc va
5 hoi » o hoi
thiet » thieu

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 ty nang ((5 hoi) OR (xa hoi)). hieu ve cam luc va ((dinh vu) OR (dinh ve)) va thiet~.
• Adding a wildcard symbol may retrieve word variants: tu sach ty nang ((5 hoi) or (xa hoi)). hieu ve cam luc va ((dinh vu) or (dinh ve)) va thiet*.