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

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