Perhaps you should try some spelling variations:
dau tren » dau tien, dat tren, dau tieng
hanh tai » thanh tai, han tai, hinh tai
hang tai » hang va, dung tai
nam thuc » nam thuoc, am thuc, nam thu
nang cau » nang cao, hang cau, nang dau
lieu ha » lieu nha, liem ha, lieu ma
thuc xa » thuc xay, tuc xa, thuc va
sac ky » cac ky, sai ky
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 nang cau hoi. ((lieu ha) or (lieu va)) nam thuc xa ((hanh tai) OR (hang tai)) dau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky nang cau hoi. ((lieu ha) OR (lieu va)) nam thuc xa ((hanh tai) OR (hang tai)) dau tren*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky nang cau hoi. ((lieu ha) or (lieu va)) nam thuc xa ((hanh tai) OR (hang tai)) dau tren*".