Perhaps you should try some spelling variations:
cham cuu » cap cuu, chat cua
nhan luc » nang luc
thi hang » thi hanh, thi nang, thi hong
su sach » so sach, vu sach
va hanh » van hanh, va thanh, va danh
hieu va » lieu va, hieu qua
ty hang » ly hang, ty xang, thu hang
cua tre » cua te, cuu tre, cua triet
ma hoi » mai hoi, xa hoi, ma hoa
vi cua » vai cua, di cua

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 ((ty hang) OR (thi hang)) ma hoi. hieu va ((nhan luc) or (cham cuu)) va hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ((ty hang) OR (thi hang)) ma hoi. hieu va ((nhan luc) OR (cham cuu)) va hanh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ((ty hang) OR (thi hang)) ma hoi. hieu va ((nhan luc) or (cham cuu)) va hanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: su sach ((ty hang) OR (thi hang)) ma hoi. hieu va ((nhan luc) or (cham cuu)) va hanh vi cua tre*.