Perhaps you should try some spelling variations:
nhanh hai » nhanh thai, thanh hai, nhanh ha
hau treo » cau treo, cau theo, dau tren
tu sach » thu sach, su sach, te sach
ly nang » ky nang, ly hang, ly vang
hieu va » lieu va, hieu qua
duc van » duc tan, duc manh, duc phan
hai hau » hai chau, dai hau, hai hai
y nang » ky nang, v nang, may nang
va cam » va cham, va cac, va cao
x hoi » xa hoi, o hoi, x ho

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ((y nang) OR (ly nang)) x hoi. hieu va cam ((duc van) or (duc va)) nhanh hai hau treo~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((y nang) OR (ly nang)) x hoi. hieu va cam ((duc van) OR (duc va)) nhanh hai hau treo.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((y nang) OR (ly nang)) x hoi. hieu va cam ((duc van) or (duc va)) nhanh hai hau treo".
• Adding a wildcard symbol may retrieve word variants: tu sach ((y nang) OR (ly nang)) x hoi. hieu va cam ((duc van) or (duc va)) nhanh hai hau treo*.