Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
hieu van » hieu va, thien van, lieu va
ban hanh » ban hang
van tuan » van quan, van ban, anh tuan
tu cach » tu cac
nang xa » nang x, lang xa, nang ma
nam xuc » cam xuc, nam xua, nam thuc
cu tren » tu tren, dua tren
ve cu » ve cau, ve chu, ve cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu cach) or (thu sach)) ky nang xa hoi. hieu van nam xuc ((ban hanh) or (van tuan)) ve cu tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu cach) OR (thu sach)) ky nang xa hoi. hieu van nam xuc ((ban hanh) OR (van tuan)) ve cu tren.
• Adding a wildcard symbol may retrieve word variants: ((tu cach) or (thu sach)) ky nang xa hoi. hieu van nam xuc ((ban hanh) or (van tuan)) ve cu tren*.