Perhaps you should try some spelling variations:
quoc tuan » quoc quan, quoc toan, quoc quang
soc tuan » ngoc tuan, soc trang, soc tuong
cau tren » cu tren, dau tren, ca tren
tu sach » thu sach, su sach, te sach
ty nang » ky nang, ty xang, ty hang
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
va cham » va chat, va tham
anh vi » hanh vi, anh va, anh ve
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: ((thu hoach) or (tu sach)) ty nang xa hoi. hieu va cham ((soc tuan) OR (quoc tuan)) anh vi cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu hoach) OR (tu sach)) ty nang xa hoi. hieu va cham ((soc tuan) OR (quoc tuan)) anh vi cau tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu hoach) or (tu sach)) ty nang xa hoi. hieu va cham ((soc tuan) OR (quoc tuan)) anh vi cau tren".
• Adding a wildcard symbol may retrieve word variants: ((thu hoach) or (tu sach)) ty nang xa hoi. hieu va cham ((soc tuan) OR (quoc tuan)) anh vi cau tren*.