Perhaps you should try some spelling variations:
cham mat » ham mat, nham mat, pham ma
cham sat » cham soc, khao sat, giam sat
su sach » so sach, vu sach
hanh di » hanh de, hang di, danh di
cua tre » cua te, cuu tre, cua triet
hieu va » lieu va, hieu qua
lang xa » lang ha, dang xay, lang van
y lang » o lang, _ lang, tay lang

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 y lang xa hoi. hieu va ((cham sat) or (cham mat)) ban ((hanh di) OR (hanh vi)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y lang xa hoi. hieu va ((cham sat) OR (cham mat)) ban ((hanh di) OR (hanh vi)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach y lang xa hoi. hieu va ((cham sat) or (cham mat)) ban ((hanh di) OR (hanh vi)) cua tre".
• Adding a wildcard symbol may retrieve word variants: su sach y lang xa hoi. hieu va ((cham sat) or (cham mat)) ban ((hanh di) OR (hanh vi)) cua tre*.