Perhaps you should try some spelling variations:
thanh hai » thanh phan, thanh hoa, thanh san
van chat » cao chat
thuc dan » thuc hanh, hoc dan, thuc vat
chu tren » cu tren, cau tren, chu trang
van cau » van dau, van hau, toan cau
sach ky » sac ky, sach y, sach ty
truc va » thuc va, thuc vat, trung va
nang xa » nang x, lang xa, nang ma
hai chu » hai chau, hoi chu, hai chi
su sach » so sach, vu sach

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 nang xa hoi. hieu ((van cau) OR (van chat)) ((truc va) or (thuc dan)) thanh hai chu tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky nang xa hoi. hieu ((van cau) OR (van chat)) ((truc va) OR (thuc dan)) thanh hai chu tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky nang xa hoi. hieu ((van cau) OR (van chat)) ((truc va) or (thuc dan)) thanh hai chu tren".
• Adding a wildcard symbol may retrieve word variants: su sach ky nang xa hoi. hieu ((van cau) OR (van chat)) ((truc va) or (thuc dan)) thanh hai chu tren*.