Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
thu sach » thuoc sach, thu hoach, khau sach
tu sach » su sach, te sach, tu cach
ty nang » ky nang, ty xang, ty hang
nang xa » nang x, lang xa, nang ma
cac dac » cac dan, cac dai, cac bac
dau thi » cau thi, dan thi, dao thi
thi cuu » thi cuc, thi huu, thi cu
cuu tre » cua tre, cau tren, cau treo
dac va » duc va, day va, dat va
va dau » va dao

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 (((thu sach) OR (thuat sach)))) ty nang xa hoi. lieu va cac dac va dau thi cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (((thu sach) OR (thuat sach)))) ty nang xa hoi. lieu va cac dac va dau thi cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (((thu sach) OR (thuat sach)))) ty nang xa hoi. lieu va cac dac va dau thi cuu tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (((thu sach) OR (thuat sach)))) ty nang xa hoi. lieu va cac dac va dau thi cuu tre*.