Perhaps you should try some spelling variations:
vu khach » vu khanh, vu khac, vay khach
hanh lam » thanh lap, hanh kem, hanh va
cham duc » pham duc, cham soc, pham duy
lam cua » nam cua, lam chat
va hanh » van hanh, va thanh, va danh
hieu ve » hieu va, hieu van
hieu vu » hieu va, hieu su, dieu vu
tang ma » mang may, tang van
ty tang » tay tang, ty xang, ty hang
su sach » so sach, vu sach
cua tre » cua te, cuu tre, cua triet
ma hoi » mai hoi, xa hoi, ma hoa

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: ((vu khach) or (su sach)) ty tang ma hoi. ((hieu vu) or (hieu ve)) cham duc va hanh lam cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu khach) OR (su sach)) ty tang ma hoi. ((hieu vu) OR (hieu ve)) cham duc va hanh lam cua tre.
• Adding a wildcard symbol may retrieve word variants: ((vu khach) or (su sach)) ty tang ma hoi. ((hieu vu) or (hieu ve)) cham duc va hanh lam cua tre*.