Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
hieu viec » nhieu viec, hieu ve, sieu viet
lang mai » lang dai, lang hai, lang man
viec dai » vien dai, viec tai, viec dat
dai nuoc » dat nuoc, dau nuoc, dai luoc
ky lang » ky nang, ky dang, ky tang
mai hoi » mai khoi, dai hoi, lai hoi
va hanh » van hanh, va thanh, va danh
hanh va » hang va, hanh vi
va cua » va chua, via cua, ca cua
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((thuat sach) or (((hoc cac) OR (hoc cao)))) ky lang mai hoi. hieu viec dai nuoc va hanh va cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thuat sach) OR (((hoc cac) OR (hoc cao)))) ky lang mai hoi. hieu viec dai nuoc va hanh va cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thuat sach) or (((hoc cac) OR (hoc cao)))) ky lang mai hoi. hieu viec dai nuoc va hanh va cua te".
• Adding a wildcard symbol may retrieve word variants: ((thuat sach) or (((hoc cac) OR (hoc cao)))) ky lang mai hoi. hieu viec dai nuoc va hanh va cua te*.