Perhaps you should try some spelling variations:
hanh hai » thanh hai, nhanh hai, hang hai
thuc dan » thuc hanh, hoc dan, thuc vat
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
hai cua » thai cua, dai cua, hoi cua
van cau » van dau, van hau, van chat
dan cac » dan cach, dang cac, dan ca
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
loc va » hoc va, luc va
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: su sach ky lang xa hoi. hieu ((dan cac) or (van cau)) ((loc va) or (thuc dan)) hanh hai cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky lang xa hoi. hieu ((dan cac) OR (van cau)) ((loc va) OR (thuc dan)) hanh hai cua tu.
• Adding a wildcard symbol may retrieve word variants: su sach ky lang xa hoi. hieu ((dan cac) or (van cau)) ((loc va) or (thuc dan)) hanh hai cua tu*.