Perhaps you should try some spelling variations:
cham hoi » cham voi, cham h'roi, pham hoai
dang xay » dang van, van xay
cham hoc » cham soc, chat hoc, cho hoc
sach ly » sach lo, sach ty, sach hay
hanh di » hanh vi, hanh de, hang di
va hanh » van hanh, va thanh, va danh
hieu va » lieu va, hieu qua
xay hoi » xa hoi, tay hoi, cay phoi
di cua » dai cua, doi cua, de cua
cua tu » cua tuc, cua su, cua cu

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu ((sach ly) or (sach y)) dang xay hoi. hieu va ((cham hoc) OR (cham hoi)) va hanh di cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu ((sach ly) OR (sach y)) dang xay hoi. hieu va ((cham hoc) OR (cham hoi)) va hanh di cua tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu ((sach ly) or (sach y)) dang xay hoi. hieu va ((cham hoc) OR (cham hoi)) va hanh di cua tu".
• Adding a wildcard symbol may retrieve word variants: thu ((sach ly) or (sach y)) dang xay hoi. hieu va ((cham hoc) OR (cham hoi)) va hanh di cua tu*.