Perhaps you should try some spelling variations:
cach thuc » anh thuc, cac thu
thai cua » than cua, tai cuc, tri cua
cam hoc » cao hoc, am hoc, cam hoa
hai cua » dai cua, hoi cua, lai cua
va danh » va dinh, va dan, va hanh
hieu ve » hieu va, hieu van
sach ty » sach y, sach tu, sach thu
lang xa » lang ha, dang xay, lang van
ve cam » ve cham, ve cac, va cam

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 ty) or (cach thuc)) lang xa hoi. hieu ve cam hoc va danh ((hai cua) or (thai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ty) OR (cach thuc)) lang xa hoi. hieu ve cam hoc va danh ((hai cua) OR (thai cua)) tre.
• Adding a wildcard symbol may retrieve word variants: tu ((sach ty) or (cach thuc)) lang xa hoi. hieu ve cam hoc va danh ((hai cua) or (thai cua)) tre*.