Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
ung tren » dung tren, muong tren, trung tren
ly nang » ky nang, ly hang, ly vang
mai hoi » mai khoi, dai hoi, lai hoi
sach ly » sach y, sach lo, sach ty
ma hoi » xa hoi, ma hoa, me hoi
va cam » va cham, va cac, va cao
xuc va » duc va, tuc va, xac va
luc va » duc va, tuc va, loc va
vi ung » va ung, vi luong, vi trung

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 ly nang ((ma hoi) OR (mai hoi)). lieu va cam ((xuc va) or (luc va)) hanh vi ung tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach ly nang ((ma hoi) OR (mai hoi)). lieu va cam ((xuc va) OR (luc va)) hanh vi ung tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat sach ly nang ((ma hoi) OR (mai hoi)). lieu va cam ((xuc va) or (luc va)) hanh vi ung tren".
• Adding a wildcard symbol may retrieve word variants: thuat sach ly nang ((ma hoi) OR (mai hoi)). lieu va cam ((xuc va) or (luc va)) hanh vi ung tren*.