Perhaps you should try some spelling variations:
cham hoc » chat hoc, cham hoi, cho hoc
hanh doi » thanh doi, hanh noi, hang doi
sach dao » lanh dao
doi cua » dai cua, hoi cua
va hanh » van hanh, va thanh, va danh
sach lo » sach doi, sach hoi, sach moi
hieu va » lieu va, hieu qua
lang xa » lang ha, dang xay, lang van
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 lo) or (sach dao)) lang xa hoi. hieu va ((cham hoc) or (cham soc)) va hanh doi cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu ((sach lo) OR (sach dao)) lang xa hoi. hieu va ((cham hoc) OR (cham soc)) va hanh doi cua tu.
• Adding a wildcard symbol may retrieve word variants: thu ((sach lo) or (sach dao)) lang xa hoi. hieu va ((cham hoc) or (cham soc)) va hanh doi cua tu*.