Perhaps you should try some spelling variations:
cham xuc » cam xuc, chat xuc, cham soc
su sach » so sach, vu sach
nang ma » tang ma, sang ma, nang cao
hieu ve » hieu va, hieu van
ve cham » va cham, ve chat, vu cham
xuc van » duc van, luc van, vuc van
van han » van hanh, van phan, van nhan
tai va » thai va, tri va, dai va
thiet » thieu

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 y ((nang ma) or (nang x)) hoi. hieu ve cham xuc van han ((tai va) OR (mai va)) thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y ((nang ma) OR (nang x)) hoi. hieu ve cham xuc van han ((tai va) OR (mai va)) thiet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y ((nang ma) or (nang x)) hoi. hieu ve cham xuc van han ((tai va) OR (mai va)) thiet".
• Adding a wildcard symbol may retrieve word variants: su sach y ((nang ma) or (nang x)) hoi. hieu ve cham xuc van han ((tai va) OR (mai va)) thiet*.