Perhaps you should try some spelling variations:
hai chu » hai chau, hoi chu, hai chi
hai cau » hai chau, hai hau, hoi cau
va hanh » van hanh, va thanh, va danh
cam loc » cam lo
tu sach » thu sach, te sach, tu cach
hieu va » lieu va, hieu qua
nang ma » tang ma, sang ma, nang cao
su sach » so sach, vu sach
ma hoi » mai hoi, xa hoi, ma hoa
loc va » hoc va, luc va
y nang » ky nang, ly nang, v nang
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) OR (su sach)) y nang ma hoi. hieu va cam loc va hanh ((hai cau) or (hai chu)) treo~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) y nang ma hoi. hieu va cam loc va hanh ((hai cau) OR (hai chu)) treo.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (su sach)) y nang ma hoi. hieu va cam loc va hanh ((hai cau) or (hai chu)) treo".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (su sach)) y nang ma hoi. hieu va cam loc va hanh ((hai cau) or (hai chu)) treo*.