Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
hanh tai » thanh tai, hang tai, han tai
chat duc » chat xuc, chat doc, chet duoc
cau tren » cu tren, dau tren, ca tren
thi nang » thi cong, thi hanh
ki nang » ky nang
hieu va » lieu va, hieu qua
hanh va » hang va, hanh vi
va chat » van chat, va phat, cao chat

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuat sach ((thi nang) OR (ki nang)) xa hoi. hieu va chat duc va ((hanh tai) or (hanh va)) cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach ((thi nang) OR (ki nang)) xa hoi. hieu va chat duc va ((hanh tai) OR (hanh va)) cau tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat sach ((thi nang) OR (ki nang)) xa hoi. hieu va chat duc va ((hanh tai) or (hanh va)) cau tren".
• Adding a wildcard symbol may retrieve word variants: thuat sach ((thi nang) OR (ki nang)) xa hoi. hieu va chat duc va ((hanh tai) or (hanh va)) cau tren*.