Perhaps you should try some spelling variations:
so sach » so sanh, bo sach, co sach
cam tuc » cam tu, nam thuc, dam thuc
va hanh » van hanh, va thanh, va danh
sach ty » sach y, sach tu, sach thu
thai va » thai van
hieu va » lieu va, hieu qua
sang ma » tang ma, nang ma, sang tao
ty sang » ty xang, ty hang, duy sang
ma hoi » mai hoi, xa hoi, ma hoa
tai va » mai 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: so sach ty sang ma hoi. hieu va ((cam tuc) or (cam xuc)) va hanh ((tai va) OR (thai va)) thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach ty sang ma hoi. hieu va ((cam tuc) OR (cam xuc)) va hanh ((tai va) OR (thai va)) thiet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach ty sang ma hoi. hieu va ((cam tuc) or (cam xuc)) va hanh ((tai va) OR (thai va)) thiet*".