Perhaps you should try some spelling variations:
vu khach » vu khanh, vu khac, vay khach
hanh lam » thanh lap, hanh kem, hanh va
tai khoi » tai khoa, tao khoi, tai hoi
cham duc » pham duc, cham soc, pham duy
mai khoi » mai khoa, tai khoa, cac khoi
vu sach » vu bach, su sach
lam cua » nam cua, lam chat
va hanh » van hanh, va thanh, va danh
cua tre » cua te, cuu tre, cua triet
va cham » va chat, va tham
tu tang » tuc tang, tu trang, tu tong

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)) tu tang ((tai khoi) or (mai khoi)). lieu va cham duc va hanh lam cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu sach) OR (vu khach)) tu tang ((tai khoi) OR (mai khoi)). lieu va cham duc va hanh lam cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((vu sach) OR (vu khach)) tu tang ((tai khoi) or (mai khoi)). lieu va cham duc va hanh lam cua tre".
• Adding a wildcard symbol may retrieve word variants: ((vu sach) OR (vu khach)) tu tang ((tai khoi) or (mai khoi)). lieu va cham duc va hanh lam cua tre*.