Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
cham mat » ham mat, nham mat, pham ma
ban hanh » ban hang
cham sat » cham soc, khao sat, giam sat
cua tre » cua te, cuu tre, dua tren
hanh di » hanh vi, hanh de, hang di
su sach » so sach, vu sach
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 ((cua tre) OR (cua triet))~.
• 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 ((cua tre) OR (cua triet)).
• 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 ((cua tre) OR (cua triet))".
• Adding a wildcard symbol may retrieve word variants: su sach y lang xa hoi. hieu va ((cham sat) or (cham mat)) ban hanh di ((cua tre) OR (cua triet))*.