Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
va thanh » gia thanh, ban thanh, va tinh
va hanh » van hanh, va danh, ban hanh
cac xuc » cam xuc, cac nuoc, chat xuc
sach tu » sach thu, cach tu, sach ty
su tien » su kien, su hien, tu tieng
hieu ve » hieu va, hieu van
tu nang » tru nang, tu nong, tu nano
ma hoi » mai hoi, xa hoi, me hoi
ve cac » va cac, vien cac
vi su » va su, ve su, ki su

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach tu nang ((ma hoi) OR (ma hoa)). hieu ve cac xuc ((va hanh) or (va thanh)) vi su tien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach tu nang ((ma hoi) OR (ma hoa)). hieu ve cac xuc ((va hanh) OR (va thanh)) vi su tien.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach tu nang ((ma hoi) OR (ma hoa)). hieu ve cac xuc ((va hanh) or (va thanh)) vi su tien".
• Adding a wildcard symbol may retrieve word variants: toc sach tu nang ((ma hoi) OR (ma hoa)). hieu ve cac xuc ((va hanh) or (va thanh)) vi su tien*.