Perhaps you should try some spelling variations:
thuc van » thuc vat, thuc dan, thuc va
su triet » su viet, su tien, ve triet
nang ho » nang hoc, nang co, tang ho
hieu va » lieu va, hieu qua
xuc van » luc van, vuc van, xuc ban
duc van » duc va, duc tan, duc manh
han tai » hang tai, nhan tai, van tai
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai ky
ho hai » hoc hai, pho hai, cho hai
tai su » tai so, tai tu, lai su

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 ho hai. hieu va cac ((((xuc van) or (thuc van))) or (duc van)) han tai su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky nang ho hai. hieu va cac ((((xuc van) OR (thuc van))) OR (duc van)) han tai su triet.
• Adding a wildcard symbol may retrieve word variants: tu sac ky nang ho hai. hieu va cac ((((xuc van) or (thuc van))) or (duc van)) han tai su triet*.