Perhaps you should try some spelling variations:
tao khoi » tao hoi, thao khoa, tao boi
than tai » thanh tai, toan tai, nhan tai
lao khoa » lo khoa, da khoa, ly khoa
cua tre » cua te, cuu tre, cua triet
han tai » hang tai, nhan tai, van tai
lieu ha » lieu nha, lieu va, liem ha
ky sang » ky nang, ky dang, ky tang
sac ky » cac ky, sai ky
thu xa » thu xac, thu ha, thu xe
tu sac » tu sach, tu cac, tu san

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sac ky sang ((tao khoi) OR (lao khoa)). lieu ha nam thu xa ((han tai) or (than tai)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky sang ((tao khoi) OR (lao khoa)). lieu ha nam thu xa ((han tai) OR (than tai)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky sang ((tao khoi) OR (lao khoa)). lieu ha nam thu xa ((han tai) or (than tai)) cua tre".
• Adding a wildcard symbol may retrieve word variants: tu sac ky sang ((tao khoi) OR (lao khoa)). lieu ha nam thu xa ((han tai) or (than tai)) cua tre*.