Perhaps you should try some spelling variations:
dau tren » dau tien, dat tren, dau tieng
te sach » toc sach
ty nang » ty xang, ty hang, ly nang
mai hoi » mai khoi, dai hoi, lai hoi
hieu ve » hieu va, hieu van
han tai » hang tai, nhan tai, van tai
tai dau » tac dau, tai du, thi dau
ve cam » ve cham, ve cac, va cam
xuc va » tuc va, luc va, xac va

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ((ty nang) OR (ky nang)) mai hoi. hieu ve cam ((xuc va) or (duc va)) han tai dau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((ty nang) OR (ky nang)) mai hoi. hieu ve cam ((xuc va) OR (duc va)) han tai dau tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((ty nang) OR (ky nang)) mai hoi. hieu ve cam ((xuc va) or (duc va)) han tai dau tren".
• Adding a wildcard symbol may retrieve word variants: te sach ((ty nang) OR (ky nang)) mai hoi. hieu ve cam ((xuc va) or (duc va)) han tai dau tren*.