Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
van hanh » van thanh, ban hanh, van anh
cham xuc » cam xuc, chat xuc, cham soc
xuc van » duc van, luc van, vuc van
ve cham » va cham, ve chat, vu cham
hieu ve » hieu va, hieu van
sach ty » sach y, sach tu, sach thu
tang ma » tang van
vai va » mai va, dai va, hai 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: thu sach ty ((tang ma) OR (mang may)) hoa. hieu ve cham xuc van hanh ((vai va) or (hoi va)) thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ty ((tang ma) OR (mang may)) hoa. hieu ve cham xuc van hanh ((vai va) OR (hoi va)) thiet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ty ((tang ma) OR (mang may)) hoa. hieu ve cham xuc van hanh ((vai va) or (hoi va)) thiet".
• Adding a wildcard symbol may retrieve word variants: thu sach ty ((tang ma) OR (mang may)) hoa. hieu ve cham xuc van hanh ((vai va) or (hoi va)) thiet*.