Perhaps you should try some spelling variations:
hai chau » lai chau, ha chau, hat chau
van hanh » van thanh, ban hanh, van anh
hai hau » dai hau, hai hai, lai chau
luc van » luoc van, luu van, duc van
tu sach » thu sach, su sach, te sach
nang ma » tang ma, sang ma, nang cao
y nang » ky nang, ly nang, v nang
ve cam » ve cham, ve cac, ve cai
ma hoi » mai hoi, xa hoi, ma hoa
va cam » va cham, va cac, va cao

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 ma hoi. hieu ((ve cam) OR (va cam)) luc van hanh ((hai hau) or (hai chau)) treo~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang ma hoi. hieu ((ve cam) OR (va cam)) luc van hanh ((hai hau) OR (hai chau)) treo.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y nang ma hoi. hieu ((ve cam) OR (va cam)) luc van hanh ((hai hau) or (hai chau)) treo".
• Adding a wildcard symbol may retrieve word variants: tu sach y nang ma hoi. hieu ((ve cam) OR (va cam)) luc van hanh ((hai hau) or (hai chau)) treo*.