Perhaps you should try some spelling variations:
cham tuc » nham thuc, pham thuc, tham thuc
su sach » so sach, vu sach
cua tre » cuu tre, cua triet, dua tren
va hanh » van hanh, va thanh, va danh
va dinh » van dinh, va kinh, va tinh
va cham » va chat, va tham
hieu va » lieu va, hieu qua
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 va cham tuc ((va dinh) 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 va cham tuc ((va dinh) 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 va cham tuc ((va dinh) or (va hanh)) va ((cua tre) OR (cua te))*".