Perhaps you should try some spelling variations:
hanh doi » thanh doi, hanh noi, hang doi
cham duc » pham duc, cham soc, pham duy
hieu van » hieu va, thien van, lieu va
vu sach » vu bach, su sach, vu khach
doi cua » dai cua, hoi cua, dong cua
va hanh » van hanh, va thanh, va danh
hieu ve » hieu va
sach ly » sach y, sach lo, sach ty
sang ma » tang ma, nang ma, sang tao
nang xa » nang x, lang xa, nang ma
cua tre » cua te, cuu tre, cua triet

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 ly ((nang xa) or (sang ma)) hoi. ((hieu ve) OR (hieu van)) cham duc va hanh doi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ly ((nang xa) OR (sang ma)) hoi. ((hieu ve) OR (hieu van)) cham duc va hanh doi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ly ((nang xa) or (sang ma)) hoi. ((hieu ve) OR (hieu van)) cham duc va hanh doi cua tre".
• Adding a wildcard symbol may retrieve word variants: vu sach ly ((nang xa) or (sang ma)) hoi. ((hieu ve) OR (hieu van)) cham duc va hanh doi cua tre*.