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
vu sach » vu bach, su sach
lam cuu » lam chu, lam cua, cham cuu
va hanh » van hanh, va thanh, va danh
vu cham » va cham, vu kham, tu cham
hieu vu » hieu va, hieu ve, hieu su
cuu tre » cua tre, cau tren, cau treo
ty tang » tay tang, ty xang, ty hang
ma hoi » mai hoi, xa hoi, me hoi

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((vu sach) or (vu khach)) ty tang ((ma hoi) OR (ma hoa)). hieu vu cham duc va hanh lam cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu sach) OR (vu khach)) ty tang ((ma hoi) OR (ma hoa)). hieu vu cham duc va hanh lam cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((vu sach) or (vu khach)) ty tang ((ma hoi) OR (ma hoa)). hieu vu cham duc va hanh lam cuu tre".
• Adding a wildcard symbol may retrieve word variants: ((vu sach) or (vu khach)) ty tang ((ma hoi) OR (ma hoa)). hieu vu cham duc va hanh lam cuu tre*.