Perhaps you should try some spelling variations:
cao hoat » cac hoat, co hoat, cao chat
tao hoat » tao hoa, toan hoat, tao chat
su sach » so sach, vu sach
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 » tuc va, loc va
dan vi » doan vi, don vi, dan va
vi cua » vai cua, di cua
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ty nang ((tao hoat) OR (cao hoat)). hieu ve cam ((luc va) or (duc va)) dan vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty nang ((tao hoat) OR (cao hoat)). hieu ve cam ((luc va) OR (duc va)) dan vi cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ty nang ((tao hoat) OR (cao hoat)). hieu ve cam ((luc va) or (duc va)) dan vi cua te".
• Adding a wildcard symbol may retrieve word variants: su sach ty nang ((tao hoat) OR (cao hoat)). hieu ve cam ((luc va) or (duc va)) dan vi cua te*.