Perhaps you should try some spelling variations:
day thanh » dao thanh, dat thanh, da thanh
thuc day » thuc dan, thuc vat
su sach » so sach, vu sach
hai cuc » tai cuc, hai cua, thai cua
hai cuu » hai cua, hai chu, thai cua
ve chat » va chat, van chat
sach ty » sach y, sach tu, sach thu
ve nham » ve nha, ve cham
nang xa » nang x, lang xa, nang ma
ty nang » ky nang, ty xang, ty hang

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ty nang xa hoi. hieu ((ve nham) or (ve chat)) thuc day thanh ((hai cuu) OR (hai cuc)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty nang xa hoi. hieu ((ve nham) OR (ve chat)) thuc day thanh ((hai cuu) OR (hai cuc)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ty nang xa hoi. hieu ((ve nham) or (ve chat)) thuc day thanh ((hai cuu) OR (hai cuc)) tre".
• Adding a wildcard symbol may retrieve word variants: su sach ty nang xa hoi. hieu ((ve nham) or (ve chat)) thuc day thanh ((hai cuu) OR (hai cuc)) tre*.