Perhaps you should try some spelling variations:
trinh vi » trinh va, trinh ve, trinh viet
va trinh » van trinh, va tinh, lap trinh
cham cuu » cap cuu, chat cua
cham luc » cham soc, nhan luc, chat lua
sach ty » sach y, sach tu, sach thu
su sach » so sach, vu sach
hieu va » lieu va
tang ma » mang may, tang van
ty tang » tay tang, ty xang, ty 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.

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