Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
thanh hai » thanh phan, thanh hoa, thanh san
hieu van » hieu va, thien van, lieu va
va thanh » gia thanh, ban thanh, va tinh
cham duc » pham duc, cham soc, pham duy
cau tren » cu tren, dau tren, ca tren
hieu ve » hieu va
hai cau » hai chau, hai chu, hai hau
y nang » ky nang, ly nang, may nang
v nang » va nang, vu nang, van nang

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 ((y nang) or (v nang)) xa hoi. ((hieu ve) OR (hieu van)) cham duc va thanh hai cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach ((y nang) OR (v nang)) xa hoi. ((hieu ve) OR (hieu van)) cham duc va thanh hai cau tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat sach ((y nang) or (v nang)) xa hoi. ((hieu ve) OR (hieu van)) cham duc va thanh hai cau tren".
• Adding a wildcard symbol may retrieve word variants: thuat sach ((y nang) or (v nang)) xa hoi. ((hieu ve) OR (hieu van)) cham duc va thanh hai cau tren*.