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
cau tren » cu tren, dau tren, ca tren
su sach » so sach, vu sach
nang xa » nang x, lang xa, nang ma
van cam » van nam, van lam, van cau
vi cau » va cau, ve cau, di cau

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) or (thu sach)) ky nang xa hoi. hieu van cam xuc ((ban hanh) or (van tuan)) vi cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (thu sach)) ky nang xa hoi. hieu van cam xuc ((ban hanh) OR (van tuan)) vi cau tren.
• Adding a wildcard symbol may retrieve word variants: ((su sach) or (thu sach)) ky nang xa hoi. hieu van cam xuc ((ban hanh) or (van tuan)) vi cau tren*.