Perhaps you should try some spelling variations:
thuat lanh » thuat lap, thuat san
thu sach » tu sach, thuat sach, thuoc sach
hieu van » hieu va, thien van, lieu va
cau tren » cu tren, dau tren, ca tren
nang xa » nang x, lang xa, nang ma
van cam » van nam, van lam, van cau
hanh di » hanh vi, hanh de, hang di
luc va » duc va, tuc va
loc va » hoc va
di cau » da cau, diem cau

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((thu sach) or (thuat lanh)) ky nang xa hoi. hieu van cam ((luc va) OR (loc va)) hanh di cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (thuat lanh)) ky nang xa hoi. hieu van cam ((luc va) OR (loc va)) hanh di cau tren*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu sach) or (thuat lanh)) ky nang xa hoi. hieu van cam ((luc va) OR (loc va)) hanh di cau tren*".