Perhaps you should try some spelling variations:
qua cham » qua hai, qua cac, va cham
cham tuc » nham thuc, pham thuc, tham thuc
su sach » so sach, vu sach
va hanh » van hanh, va thanh, ban hanh
cua tre » cuu tre, cua triet, dua tren
va danh » va dinh, va dan, dia danh
lang xa » lang ha, dang xay, lang van
sach o » sach lo, sac o, sach y
o lang » hoa lang, hoi lang
cua te » cua tu

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 o lang xa hoi. hieu qua cham tuc ((va danh) or (va hanh)) va ((cua tre) OR (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach o lang xa hoi. hieu qua cham tuc ((va danh) OR (va hanh)) va ((cua tre) OR (cua te))*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach o lang xa hoi. hieu qua cham tuc ((va danh) or (va hanh)) va ((cua tre) OR (cua te))*".