Perhaps you should try some spelling variations:
cham truc » cau truc, nham thuc, pham thuc
sach thuc » cach thuc, sach thu, sach thue
va thanh » gia thanh, ban thanh, le thanh
qua cham » qua hai, qua cac, va cham
su triet » su viet, su tien, ve triet
va tinh » may tinh
su sach » so sach, vu sach
ma hoi » mai hoi, xa hoi, me hoi
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: su sach thuc hanh ((ma hoi) or (ma hoa)). hieu qua cham truc ((va thanh) OR (va tinh)) vi su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach thuc hanh ((ma hoi) OR (ma hoa)). hieu qua cham truc ((va thanh) OR (va tinh)) vi su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach thuc hanh ((ma hoi) or (ma hoa)). hieu qua cham truc ((va thanh) OR (va tinh)) vi su triet".
• Adding a wildcard symbol may retrieve word variants: su sach thuc hanh ((ma hoi) or (ma hoa)). hieu qua cham truc ((va thanh) OR (va tinh)) vi su triet*.