Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
viec cac » vien cac, viec lam, viec va
sach ky » sac ky, sach y, sach ty
nang ma » tang ma, sang ma, nang cao
va lang » va nang, hoa lang
hai cua » thai cua, dai cua, hoi cua
bac va » ban va, bac ha, bao va
ha cua » hoa cua, nha cua, ham cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ky nang ma hoa. hieu ((viec cac) OR (viec cua)) bac va lang ((ha cua) or (hai cua)) te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky nang ma hoa. hieu ((viec cac) OR (viec cua)) bac va lang ((ha cua) OR (hai cua)) te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky nang ma hoa. hieu ((viec cac) OR (viec cua)) bac va lang ((ha cua) or (hai cua)) te".
• Adding a wildcard symbol may retrieve word variants: thu sach ky nang ma hoa. hieu ((viec cac) OR (viec cua)) bac va lang ((ha cua) or (hai cua)) te*.