Perhaps you should try some spelling variations:
thanh lam » thanh lap, hanh lam, thanh nam
cua viet » ca viet, hoa viet, cua vat
lam cua » nam cua, lam chat
sach ky » sac ky, sach y, sach ty
su sach » so sach, vu sach
hieu ve » hieu va, hieu van
so hai » son hai, su hai, so ha
luc va » tuc va, loc va
ve cam » ve cham, ve cac, va cam
o hai » co hai, o lai, _ hai

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 ky nang ((o hai) OR (so hai)). hieu ve cam ((duc va) or (luc va)) thanh lam cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang ((o hai) OR (so hai)). hieu ve cam ((duc va) OR (luc va)) thanh lam cua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang ((o hai) OR (so hai)). hieu ve cam ((duc va) or (luc va)) thanh lam cua viet".
• Adding a wildcard symbol may retrieve word variants: su sach ky nang ((o hai) OR (so hai)). hieu ve cam ((duc va) or (luc va)) thanh lam cua viet*.