Perhaps you should try some spelling variations:
cham hoc » cham soc, chat hoc, cham hoi
lang xa » lang ha, dang xay, lang van
hieu va » lieu va, hieu qua
va cham » va chat, va tham
sac ky » cac ky, sai ky
va dan » ca dan, va dao, va dau
dan vi » doan vi, don vi, dan va
vi cua » vai cua, di cua
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: tu ((sach y) or (sac ky)) lang xa hoi. hieu va cham hoc va dan vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach y) OR (sac ky)) lang xa hoi. hieu va cham hoc va dan vi cua te.
• Adding a wildcard symbol may retrieve word variants: tu ((sach y) or (sac ky)) lang xa hoi. hieu va cham hoc va dan vi cua te*.